From 4b6d98fd75dc8a9f2ac9a32a0904a5b2949a65d9 Mon Sep 17 00:00:00 2001
From: Gui Vieira <guialbuk@gmail.com>
Date: Fri, 27 Dec 2019 15:44:30 -0800
Subject: [PATCH] Use frozen string literals

---
 .rubocop.yml                                                    | 2 --
 Appraisals                                                      | 2 ++
 Gemfile                                                         | 2 ++
 Rakefile                                                        | 2 ++
 custom_plan.rb                                                  | 2 ++
 doc_config/yard/setup.rb                                        | 2 ++
 doc_config/yard/templates/default/fulldoc/html/setup.rb         | 2 ++
 doc_config/yard/templates/default/layout/html/setup.rb          | 2 ++
 gemfiles/rails_4_2.gemfile                                      | 2 ++
 gemfiles/rails_5_0.gemfile                                      | 2 ++
 gemfiles/rails_5_1.gemfile                                      | 2 ++
 gemfiles/rails_5_2.gemfile                                      | 2 ++
 gemfiles/rails_6_0.gemfile                                      | 2 ++
 lib/shoulda-matchers.rb                                         | 2 ++
 lib/shoulda/matchers.rb                                         | 2 ++
 lib/shoulda/matchers/action_controller.rb                       | 2 ++
 lib/shoulda/matchers/action_controller/callback_matcher.rb      | 2 ++
 lib/shoulda/matchers/action_controller/filter_param_matcher.rb  | 2 ++
 lib/shoulda/matchers/action_controller/flash_store.rb           | 2 ++
 lib/shoulda/matchers/action_controller/permit_matcher.rb        | 2 ++
 lib/shoulda/matchers/action_controller/redirect_to_matcher.rb   | 2 ++
 .../matchers/action_controller/render_template_matcher.rb       | 2 ++
 .../matchers/action_controller/render_with_layout_matcher.rb    | 2 ++
 lib/shoulda/matchers/action_controller/rescue_from_matcher.rb   | 2 ++
 lib/shoulda/matchers/action_controller/respond_with_matcher.rb  | 2 ++
 lib/shoulda/matchers/action_controller/route_matcher.rb         | 2 ++
 lib/shoulda/matchers/action_controller/route_params.rb          | 2 ++
 lib/shoulda/matchers/action_controller/session_store.rb         | 2 ++
 lib/shoulda/matchers/action_controller/set_flash_matcher.rb     | 2 ++
 lib/shoulda/matchers/action_controller/set_session_matcher.rb   | 2 ++
 .../matchers/action_controller/set_session_or_flash_matcher.rb  | 2 ++
 lib/shoulda/matchers/active_model.rb                            | 2 ++
 .../matchers/active_model/allow_mass_assignment_of_matcher.rb   | 2 ++
 lib/shoulda/matchers/active_model/allow_value_matcher.rb        | 2 ++
 .../allow_value_matcher/attribute_changed_value_error.rb        | 2 ++
 .../allow_value_matcher/attribute_does_not_exist_error.rb       | 2 ++
 .../active_model/allow_value_matcher/attribute_setter.rb        | 2 ++
 .../allow_value_matcher/attribute_setter_and_validator.rb       | 2 ++
 .../active_model/allow_value_matcher/attribute_setters.rb       | 2 ++
 .../allow_value_matcher/attribute_setters_and_validators.rb     | 2 ++
 .../active_model/allow_value_matcher/successful_check.rb        | 2 ++
 .../active_model/allow_value_matcher/successful_setting.rb      | 2 ++
 lib/shoulda/matchers/active_model/disallow_value_matcher.rb     | 2 ++
 lib/shoulda/matchers/active_model/errors.rb                     | 2 ++
 .../matchers/active_model/have_secure_password_matcher.rb       | 2 ++
 lib/shoulda/matchers/active_model/helpers.rb                    | 2 ++
 lib/shoulda/matchers/active_model/numericality_matchers.rb      | 2 ++
 .../active_model/numericality_matchers/comparison_matcher.rb    | 2 ++
 .../active_model/numericality_matchers/even_number_matcher.rb   | 2 ++
 .../active_model/numericality_matchers/numeric_type_matcher.rb  | 2 ++
 .../active_model/numericality_matchers/odd_number_matcher.rb    | 2 ++
 .../active_model/numericality_matchers/only_integer_matcher.rb  | 2 ++
 lib/shoulda/matchers/active_model/qualifiers.rb                 | 2 ++
 lib/shoulda/matchers/active_model/qualifiers/allow_nil.rb       | 2 ++
 .../active_model/qualifiers/ignore_interference_by_writer.rb    | 2 ++
 .../active_model/qualifiers/ignoring_interference_by_writer.rb  | 2 ++
 .../matchers/active_model/validate_absence_of_matcher.rb        | 2 ++
 .../matchers/active_model/validate_acceptance_of_matcher.rb     | 2 ++
 .../matchers/active_model/validate_confirmation_of_matcher.rb   | 2 ++
 .../matchers/active_model/validate_exclusion_of_matcher.rb      | 2 ++
 .../matchers/active_model/validate_inclusion_of_matcher.rb      | 2 ++
 lib/shoulda/matchers/active_model/validate_length_of_matcher.rb | 2 ++
 .../matchers/active_model/validate_numericality_of_matcher.rb   | 2 ++
 .../matchers/active_model/validate_presence_of_matcher.rb       | 2 ++
 lib/shoulda/matchers/active_model/validation_matcher.rb         | 2 ++
 .../active_model/validation_matcher/build_description.rb        | 2 ++
 lib/shoulda/matchers/active_model/validation_message_finder.rb  | 2 ++
 lib/shoulda/matchers/active_model/validator.rb                  | 2 ++
 lib/shoulda/matchers/active_record.rb                           | 2 ++
 .../active_record/accept_nested_attributes_for_matcher.rb       | 2 ++
 lib/shoulda/matchers/active_record/association_matcher.rb       | 2 ++
 lib/shoulda/matchers/active_record/association_matchers.rb      | 2 ++
 .../active_record/association_matchers/counter_cache_matcher.rb | 2 ++
 .../active_record/association_matchers/dependent_matcher.rb     | 2 ++
 .../active_record/association_matchers/inverse_of_matcher.rb    | 2 ++
 .../active_record/association_matchers/join_table_matcher.rb    | 2 ++
 .../active_record/association_matchers/model_reflection.rb      | 2 ++
 .../active_record/association_matchers/model_reflector.rb       | 2 ++
 .../active_record/association_matchers/option_verifier.rb       | 2 ++
 .../active_record/association_matchers/optional_matcher.rb      | 2 ++
 .../active_record/association_matchers/order_matcher.rb         | 2 ++
 .../active_record/association_matchers/required_matcher.rb      | 2 ++
 .../active_record/association_matchers/source_matcher.rb        | 2 ++
 .../active_record/association_matchers/through_matcher.rb       | 2 ++
 lib/shoulda/matchers/active_record/define_enum_for_matcher.rb   | 2 ++
 lib/shoulda/matchers/active_record/have_db_column_matcher.rb    | 2 ++
 lib/shoulda/matchers/active_record/have_db_index_matcher.rb     | 2 ++
 .../matchers/active_record/have_readonly_attribute_matcher.rb   | 2 ++
 lib/shoulda/matchers/active_record/have_secure_token_matcher.rb | 2 ++
 lib/shoulda/matchers/active_record/serialize_matcher.rb         | 2 ++
 lib/shoulda/matchers/active_record/uniqueness.rb                | 2 ++
 lib/shoulda/matchers/active_record/uniqueness/model.rb          | 2 ++
 lib/shoulda/matchers/active_record/uniqueness/namespace.rb      | 2 ++
 .../matchers/active_record/uniqueness/test_model_creator.rb     | 2 ++
 lib/shoulda/matchers/active_record/uniqueness/test_models.rb    | 2 ++
 .../matchers/active_record/validate_uniqueness_of_matcher.rb    | 2 ++
 lib/shoulda/matchers/configuration.rb                           | 2 ++
 lib/shoulda/matchers/doublespeak.rb                             | 2 ++
 lib/shoulda/matchers/doublespeak/double.rb                      | 2 ++
 lib/shoulda/matchers/doublespeak/double_collection.rb           | 2 ++
 .../matchers/doublespeak/double_implementation_registry.rb      | 2 ++
 lib/shoulda/matchers/doublespeak/method_call.rb                 | 2 ++
 lib/shoulda/matchers/doublespeak/object_double.rb               | 2 ++
 lib/shoulda/matchers/doublespeak/proxy_implementation.rb        | 2 ++
 lib/shoulda/matchers/doublespeak/stub_implementation.rb         | 2 ++
 lib/shoulda/matchers/doublespeak/world.rb                       | 2 ++
 lib/shoulda/matchers/error.rb                                   | 2 ++
 lib/shoulda/matchers/independent.rb                             | 2 ++
 lib/shoulda/matchers/independent/delegate_method_matcher.rb     | 2 ++
 .../independent/delegate_method_matcher/stubbed_target.rb       | 2 ++
 .../delegate_method_matcher/target_not_defined_error.rb         | 2 ++
 lib/shoulda/matchers/integrations.rb                            | 2 ++
 lib/shoulda/matchers/integrations/configuration.rb              | 2 ++
 lib/shoulda/matchers/integrations/configuration_error.rb        | 2 ++
 lib/shoulda/matchers/integrations/inclusion.rb                  | 2 ++
 lib/shoulda/matchers/integrations/libraries.rb                  | 2 ++
 .../matchers/integrations/libraries/action_controller.rb        | 2 ++
 lib/shoulda/matchers/integrations/libraries/active_model.rb     | 2 ++
 lib/shoulda/matchers/integrations/libraries/active_record.rb    | 2 ++
 lib/shoulda/matchers/integrations/libraries/missing_library.rb  | 2 ++
 lib/shoulda/matchers/integrations/libraries/rails.rb            | 2 ++
 lib/shoulda/matchers/integrations/libraries/routing.rb          | 2 ++
 lib/shoulda/matchers/integrations/rails.rb                      | 2 ++
 lib/shoulda/matchers/integrations/registry.rb                   | 2 ++
 lib/shoulda/matchers/integrations/test_frameworks.rb            | 2 ++
 .../integrations/test_frameworks/active_support_test_case.rb    | 2 ++
 lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb | 2 ++
 lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb | 2 ++
 .../integrations/test_frameworks/missing_test_framework.rb      | 2 ++
 lib/shoulda/matchers/integrations/test_frameworks/rspec.rb      | 2 ++
 lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb  | 2 ++
 lib/shoulda/matchers/matcher_context.rb                         | 2 ++
 lib/shoulda/matchers/rails_shim.rb                              | 2 ++
 lib/shoulda/matchers/routing.rb                                 | 2 ++
 lib/shoulda/matchers/util.rb                                    | 2 ++
 lib/shoulda/matchers/util/word_wrap.rb                          | 2 ++
 lib/shoulda/matchers/version.rb                                 | 2 ++
 lib/shoulda/matchers/warn.rb                                    | 2 ++
 script/supported_ruby_versions                                  | 1 +
 shoulda-matchers.gemspec                                        | 2 ++
 spec/acceptance/active_model_integration_spec.rb                | 2 ++
 spec/acceptance/independent_matchers_spec.rb                    | 2 ++
 spec/acceptance/multiple_libraries_integration_spec.rb          | 2 ++
 spec/acceptance/rails_integration_spec.rb                       | 2 ++
 spec/acceptance_spec_helper.rb                                  | 2 ++
 spec/doublespeak_spec_helper.rb                                 | 2 ++
 spec/report_warnings.rb                                         | 2 ++
 spec/spec_helper.rb                                             | 2 ++
 spec/support/acceptance/adds_shoulda_matchers_to_project.rb     | 2 ++
 spec/support/acceptance/helpers.rb                              | 2 ++
 spec/support/acceptance/helpers/active_model_helpers.rb         | 2 ++
 spec/support/acceptance/helpers/array_helpers.rb                | 2 ++
 spec/support/acceptance/helpers/base_helpers.rb                 | 2 ++
 spec/support/acceptance/helpers/command_helpers.rb              | 2 ++
 spec/support/acceptance/helpers/file_helpers.rb                 | 2 ++
 spec/support/acceptance/helpers/gem_helpers.rb                  | 2 ++
 spec/support/acceptance/helpers/minitest_helpers.rb             | 2 ++
 spec/support/acceptance/helpers/n_unit_helpers.rb               | 2 ++
 spec/support/acceptance/helpers/pluralization_helpers.rb        | 2 ++
 spec/support/acceptance/helpers/rails_migration_helpers.rb      | 2 ++
 spec/support/acceptance/helpers/rails_version_helpers.rb        | 2 ++
 spec/support/acceptance/helpers/rspec_helpers.rb                | 2 ++
 spec/support/acceptance/helpers/ruby_version_helpers.rb         | 2 ++
 spec/support/acceptance/helpers/step_helpers.rb                 | 2 ++
 spec/support/acceptance/matchers/have_output.rb                 | 2 ++
 .../matchers/indicate_number_of_tests_was_run_matcher.rb        | 2 ++
 .../acceptance/matchers/indicate_that_tests_were_run_matcher.rb | 2 ++
 spec/support/tests/bundle.rb                                    | 2 ++
 spec/support/tests/command_runner.rb                            | 2 ++
 spec/support/tests/current_bundle.rb                            | 2 ++
 spec/support/tests/database.rb                                  | 2 ++
 spec/support/tests/database_adapters/postgresql.rb              | 2 ++
 spec/support/tests/database_adapters/sqlite3.rb                 | 2 ++
 spec/support/tests/database_configuration.rb                    | 2 ++
 spec/support/tests/database_configuration_registry.rb           | 2 ++
 spec/support/tests/filesystem.rb                                | 2 ++
 spec/support/tests/version.rb                                   | 2 ++
 spec/support/unit/active_record/create_table.rb                 | 2 ++
 spec/support/unit/attribute.rb                                  | 2 ++
 spec/support/unit/capture.rb                                    | 2 ++
 spec/support/unit/change_value.rb                               | 2 ++
 spec/support/unit/create_model_arguments/basic.rb               | 2 ++
 spec/support/unit/create_model_arguments/has_many.rb            | 2 ++
 spec/support/unit/create_model_arguments/uniqueness_matcher.rb  | 2 ++
 spec/support/unit/helpers/action_pack_versions.rb               | 2 ++
 spec/support/unit/helpers/active_model_helpers.rb               | 2 ++
 spec/support/unit/helpers/active_model_versions.rb              | 2 ++
 spec/support/unit/helpers/active_record_versions.rb             | 2 ++
 spec/support/unit/helpers/active_resource_builder.rb            | 2 ++
 spec/support/unit/helpers/allow_value_matcher_helpers.rb        | 2 ++
 spec/support/unit/helpers/application_configuration_helpers.rb  | 2 ++
 spec/support/unit/helpers/class_builder.rb                      | 2 ++
 spec/support/unit/helpers/column_type_helpers.rb                | 2 ++
 spec/support/unit/helpers/confirmation_matcher_helpers.rb       | 2 ++
 spec/support/unit/helpers/controller_builder.rb                 | 2 ++
 spec/support/unit/helpers/database_helpers.rb                   | 2 ++
 spec/support/unit/helpers/i18n_faker.rb                         | 2 ++
 spec/support/unit/helpers/mailer_builder.rb                     | 2 ++
 spec/support/unit/helpers/message_helpers.rb                    | 2 ++
 spec/support/unit/helpers/model_builder.rb                      | 2 ++
 spec/support/unit/helpers/rails_versions.rb                     | 2 ++
 .../support/unit/helpers/validation_matcher_scenario_helpers.rb | 2 ++
 spec/support/unit/i18n.rb                                       | 2 ++
 spec/support/unit/load_environment.rb                           | 2 ++
 spec/support/unit/matchers/deprecate.rb                         | 2 ++
 .../unit/matchers/fail_with_message_including_matcher.rb        | 2 ++
 spec/support/unit/matchers/fail_with_message_matcher.rb         | 2 ++
 spec/support/unit/matchers/match_against.rb                     | 2 ++
 spec/support/unit/matchers/print_warning_including.rb           | 2 ++
 spec/support/unit/model_creation_strategies/active_model.rb     | 2 ++
 spec/support/unit/model_creation_strategies/active_record.rb    | 2 ++
 spec/support/unit/model_creators.rb                             | 2 ++
 spec/support/unit/model_creators/active_model.rb                | 2 ++
 spec/support/unit/model_creators/active_record.rb               | 2 ++
 .../model_creators/active_record/has_and_belongs_to_many.rb     | 2 ++
 spec/support/unit/model_creators/active_record/has_many.rb      | 2 ++
 .../unit/model_creators/active_record/uniqueness_matcher.rb     | 2 ++
 spec/support/unit/model_creators/basic.rb                       | 2 ++
 spec/support/unit/rails_application.rb                          | 2 ++
 .../support/unit/record_builder_with_i18n_validation_message.rb | 2 ++
 spec/support/unit/record_validating_confirmation_builder.rb     | 2 ++
 .../unit/record_with_different_error_attribute_builder.rb       | 2 ++
 .../unit/shared_examples/ignoring_interference_by_writer.rb     | 2 ++
 spec/support/unit/shared_examples/numerical_submatcher.rb       | 2 ++
 spec/support/unit/shared_examples/set_session_or_flash.rb       | 2 ++
 spec/support/unit/validation_matcher_scenario.rb                | 2 ++
 .../shoulda/matchers/action_controller/callback_matcher_spec.rb | 2 ++
 .../matchers/action_controller/filter_param_matcher_spec.rb     | 2 ++
 .../shoulda/matchers/action_controller/permit_matcher_spec.rb   | 2 ++
 .../matchers/action_controller/redirect_to_matcher_spec.rb      | 2 ++
 .../matchers/action_controller/render_template_matcher_spec.rb  | 2 ++
 .../action_controller/render_with_layout_matcher_spec.rb        | 2 ++
 .../matchers/action_controller/rescue_from_matcher_spec.rb      | 2 ++
 .../matchers/action_controller/respond_with_matcher_spec.rb     | 2 ++
 .../shoulda/matchers/action_controller/route_matcher_spec.rb    | 2 ++
 .../shoulda/matchers/action_controller/route_params_spec.rb     | 2 ++
 .../matchers/action_controller/set_flash_matcher_spec.rb        | 2 ++
 .../matchers/action_controller/set_session_matcher_spec.rb      | 2 ++
 .../action_controller/set_session_or_flash_matcher_spec.rb      | 2 ++
 .../active_model/allow_mass_assignment_of_matcher_spec.rb       | 2 ++
 .../shoulda/matchers/active_model/allow_value_matcher_spec.rb   | 2 ++
 .../matchers/active_model/disallow_value_matcher_spec.rb        | 2 ++
 .../matchers/active_model/have_secure_password_matcher_spec.rb  | 2 ++
 spec/unit/shoulda/matchers/active_model/helpers_spec.rb         | 2 ++
 .../matchers/active_model/validate_absence_of_matcher_spec.rb   | 2 ++
 .../active_model/validate_acceptance_of_matcher_spec.rb         | 2 ++
 .../active_model/validate_confirmation_of_matcher_spec.rb       | 2 ++
 .../matchers/active_model/validate_exclusion_of_matcher_spec.rb | 2 ++
 .../matchers/active_model/validate_inclusion_of_matcher_spec.rb | 2 ++
 .../matchers/active_model/validate_length_of_matcher_spec.rb    | 2 ++
 .../active_model/validate_numericality_of_matcher_spec.rb       | 2 ++
 .../matchers/active_model/validate_presence_of_matcher_spec.rb  | 2 ++
 .../active_record/accept_nested_attributes_for_matcher_spec.rb  | 2 ++
 .../shoulda/matchers/active_record/association_matcher_spec.rb  | 2 ++
 .../active_record/association_matchers/model_reflection_spec.rb | 2 ++
 .../matchers/active_record/define_enum_for_matcher_spec.rb      | 2 ++
 .../matchers/active_record/have_db_column_matcher_spec.rb       | 2 ++
 .../matchers/active_record/have_db_index_matcher_spec.rb        | 2 ++
 .../active_record/have_readonly_attributes_matcher_spec.rb      | 2 ++
 .../matchers/active_record/have_secure_token_matcher_spec.rb    | 2 ++
 .../shoulda/matchers/active_record/serialize_matcher_spec.rb    | 2 ++
 .../active_record/validate_uniqueness_of_matcher_spec.rb        | 2 ++
 .../unit/shoulda/matchers/doublespeak/double_collection_spec.rb | 2 ++
 .../matchers/doublespeak/double_implementation_registry_spec.rb | 2 ++
 spec/unit/shoulda/matchers/doublespeak/double_spec.rb           | 2 ++
 spec/unit/shoulda/matchers/doublespeak/object_double_spec.rb    | 2 ++
 .../shoulda/matchers/doublespeak/proxy_implementation_spec.rb   | 2 ++
 .../shoulda/matchers/doublespeak/stub_implementation_spec.rb    | 2 ++
 spec/unit/shoulda/matchers/doublespeak/world_spec.rb            | 2 ++
 spec/unit/shoulda/matchers/doublespeak_spec.rb                  | 2 ++
 .../independent/delegate_method_matcher/stubbed_target_spec.rb  | 2 ++
 .../matchers/independent/delegate_method_matcher_spec.rb        | 2 ++
 spec/unit/shoulda/matchers/routing/route_matcher_spec.rb        | 2 ++
 spec/unit/shoulda/matchers/util/word_wrap_spec.rb               | 2 ++
 spec/unit_spec_helper.rb                                        | 2 ++
 spec/warnings_spy.rb                                            | 2 ++
 spec/warnings_spy/filesystem.rb                                 | 2 ++
 spec/warnings_spy/partitioner.rb                                | 2 ++
 spec/warnings_spy/reader.rb                                     | 2 ++
 spec/warnings_spy/reporter.rb                                   | 2 ++
 tasks/documentation.rb                                          | 2 ++
 281 files changed, 559 insertions(+), 2 deletions(-)

diff --git a/.rubocop.yml b/.rubocop.yml
index 6247cbb6..41faf079 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -136,8 +136,6 @@ Style/EvenOdd:
   Enabled: false
 Style/FormatString:
   Enabled: false
-Style/FrozenStringLiteralComment:
-  Enabled: false
 Style/GlobalVars:
   Enabled: false
 Style/GuardClause:
diff --git a/Appraisals b/Appraisals
index d8feefd5..ee2521f4 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Note: All of the dependencies here were obtained by running `rails new` with
 # various versions of Rails and copying lines from the generated Gemfile. It's
 # best to keep the gems here in the same order as they're listed there so you
diff --git a/Gemfile b/Gemfile
index 2a0bc09c..9077313c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gem 'appraisal', '2.2.0'
diff --git a/Rakefile b/Rakefile
index 411c8e1b..00c1d95a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/setup'
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
diff --git a/custom_plan.rb b/custom_plan.rb
index edb06a25..5d3c30d6 100644
--- a/custom_plan.rb
+++ b/custom_plan.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'zeus'
 require 'zeus/plan'
 require_relative 'spec/support/tests/current_bundle'
diff --git a/doc_config/yard/setup.rb b/doc_config/yard/setup.rb
index eb654f5b..b3c7f14b 100644
--- a/doc_config/yard/setup.rb
+++ b/doc_config/yard/setup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 YARD::Templates::Engine.register_template_path(File.dirname(__FILE__) + '/templates')
 
 require 'pygments.rb'
diff --git a/doc_config/yard/templates/default/fulldoc/html/setup.rb b/doc_config/yard/templates/default/fulldoc/html/setup.rb
index 1696df6d..b727b968 100644
--- a/doc_config/yard/templates/default/fulldoc/html/setup.rb
+++ b/doc_config/yard/templates/default/fulldoc/html/setup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 def stylesheets_full_list
   %w(css/solarized.css css/bootstrap.css css/global.css) + super
 end
diff --git a/doc_config/yard/templates/default/layout/html/setup.rb b/doc_config/yard/templates/default/layout/html/setup.rb
index ec952ba9..cb4799e3 100644
--- a/doc_config/yard/templates/default/layout/html/setup.rb
+++ b/doc_config/yard/templates/default/layout/html/setup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 def stylesheets
   %w(css/solarized.css css/bootstrap.css css/global.css) + super
 end
diff --git a/gemfiles/rails_4_2.gemfile b/gemfiles/rails_4_2.gemfile
index a1496597..c77509f1 100644
--- a/gemfiles/rails_4_2.gemfile
+++ b/gemfiles/rails_4_2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_5_0.gemfile b/gemfiles/rails_5_0.gemfile
index ec631a88..f0feef6b 100644
--- a/gemfiles/rails_5_0.gemfile
+++ b/gemfiles/rails_5_0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_5_1.gemfile b/gemfiles/rails_5_1.gemfile
index 42933295..243153e5 100644
--- a/gemfiles/rails_5_1.gemfile
+++ b/gemfiles/rails_5_1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_5_2.gemfile b/gemfiles/rails_5_2.gemfile
index 75740d37..709c3ef9 100644
--- a/gemfiles/rails_5_2.gemfile
+++ b/gemfiles/rails_5_2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/gemfiles/rails_6_0.gemfile b/gemfiles/rails_6_0.gemfile
index 5415e171..4b705099 100644
--- a/gemfiles/rails_6_0.gemfile
+++ b/gemfiles/rails_6_0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
diff --git a/lib/shoulda-matchers.rb b/lib/shoulda-matchers.rb
index 8d85daf3..98f3acae 100644
--- a/lib/shoulda-matchers.rb
+++ b/lib/shoulda-matchers.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers'
diff --git a/lib/shoulda/matchers.rb b/lib/shoulda/matchers.rb
index b4c00d1e..91cf1c85 100644
--- a/lib/shoulda/matchers.rb
+++ b/lib/shoulda/matchers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/configuration'
 require 'shoulda/matchers/doublespeak'
 require 'shoulda/matchers/error'
diff --git a/lib/shoulda/matchers/action_controller.rb b/lib/shoulda/matchers/action_controller.rb
index 91dd016f..9a24d797 100644
--- a/lib/shoulda/matchers/action_controller.rb
+++ b/lib/shoulda/matchers/action_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/action_controller/filter_param_matcher'
 require 'shoulda/matchers/action_controller/route_params'
 require 'shoulda/matchers/action_controller/set_flash_matcher'
diff --git a/lib/shoulda/matchers/action_controller/callback_matcher.rb b/lib/shoulda/matchers/action_controller/callback_matcher.rb
index 5b915270..f4df864b 100644
--- a/lib/shoulda/matchers/action_controller/callback_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/callback_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/filter_param_matcher.rb b/lib/shoulda/matchers/action_controller/filter_param_matcher.rb
index c8e06b1c..4f6b2b2d 100644
--- a/lib/shoulda/matchers/action_controller/filter_param_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/filter_param_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/flash_store.rb b/lib/shoulda/matchers/action_controller/flash_store.rb
index d48fef72..02cfa3cd 100644
--- a/lib/shoulda/matchers/action_controller/flash_store.rb
+++ b/lib/shoulda/matchers/action_controller/flash_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/permit_matcher.rb b/lib/shoulda/matchers/action_controller/permit_matcher.rb
index ef184aaf..a93f4d58 100644
--- a/lib/shoulda/matchers/action_controller/permit_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/permit_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 begin
diff --git a/lib/shoulda/matchers/action_controller/redirect_to_matcher.rb b/lib/shoulda/matchers/action_controller/redirect_to_matcher.rb
index c68ae67d..0a3b256e 100644
--- a/lib/shoulda/matchers/action_controller/redirect_to_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/redirect_to_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/render_template_matcher.rb b/lib/shoulda/matchers/action_controller/render_template_matcher.rb
index c373e905..dc4ee930 100644
--- a/lib/shoulda/matchers/action_controller/render_template_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/render_template_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/render_with_layout_matcher.rb b/lib/shoulda/matchers/action_controller/render_with_layout_matcher.rb
index 358d210a..e3c939fc 100644
--- a/lib/shoulda/matchers/action_controller/render_with_layout_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/render_with_layout_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/rescue_from_matcher.rb b/lib/shoulda/matchers/action_controller/rescue_from_matcher.rb
index c791fa1f..3fec7c1d 100644
--- a/lib/shoulda/matchers/action_controller/rescue_from_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/rescue_from_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/respond_with_matcher.rb b/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
index ef6e1bcd..a4b95ee8 100644
--- a/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/route_matcher.rb b/lib/shoulda/matchers/action_controller/route_matcher.rb
index 1d14a2c1..1a733a10 100644
--- a/lib/shoulda/matchers/action_controller/route_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/route_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/route_params.rb b/lib/shoulda/matchers/action_controller/route_params.rb
index 2e4413a0..e3e96acb 100644
--- a/lib/shoulda/matchers/action_controller/route_params.rb
+++ b/lib/shoulda/matchers/action_controller/route_params.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/session_store.rb b/lib/shoulda/matchers/action_controller/session_store.rb
index a63d238b..84588068 100644
--- a/lib/shoulda/matchers/action_controller/session_store.rb
+++ b/lib/shoulda/matchers/action_controller/session_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/action_controller/set_flash_matcher.rb b/lib/shoulda/matchers/action_controller/set_flash_matcher.rb
index 10aea10b..9ceb1cb5 100644
--- a/lib/shoulda/matchers/action_controller/set_flash_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/set_flash_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/action_controller/set_session_matcher.rb b/lib/shoulda/matchers/action_controller/set_session_matcher.rb
index 01189eba..42018494 100644
--- a/lib/shoulda/matchers/action_controller/set_session_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/set_session_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb b/lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb
index f004ebe2..5d00d842 100644
--- a/lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActionController
diff --git a/lib/shoulda/matchers/active_model.rb b/lib/shoulda/matchers/active_model.rb
index cab68545..f22b6bb4 100644
--- a/lib/shoulda/matchers/active_model.rb
+++ b/lib/shoulda/matchers/active_model.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/active_model/helpers'
 require 'shoulda/matchers/active_model/qualifiers'
 require 'shoulda/matchers/active_model/validation_matcher'
diff --git a/lib/shoulda/matchers/active_model/allow_mass_assignment_of_matcher.rb b/lib/shoulda/matchers/active_model/allow_mass_assignment_of_matcher.rb
index 2c81db7b..f704095a 100644
--- a/lib/shoulda/matchers/active_model/allow_mass_assignment_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/allow_mass_assignment_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher.rb b/lib/shoulda/matchers/active_model/allow_value_matcher.rb
index bbf4b8fb..b1c7d6a3 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_changed_value_error.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_changed_value_error.rb
index 417982ee..f096b8a7 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_changed_value_error.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_changed_value_error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_does_not_exist_error.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_does_not_exist_error.rb
index a56066c4..a178d495 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_does_not_exist_error.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_does_not_exist_error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter.rb
index fc7570be..e45afb95 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter_and_validator.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter_and_validator.rb
index 8d89fbe3..e024614b 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter_and_validator.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setter_and_validator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters.rb
index 97b618e3..b47953ba 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters_and_validators.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters_and_validators.rb
index f28f1f6a..3b4315eb 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters_and_validators.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/attribute_setters_and_validators.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/successful_check.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/successful_check.rb
index 2381d030..5aaa2959 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/successful_check.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/successful_check.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher/successful_setting.rb b/lib/shoulda/matchers/active_model/allow_value_matcher/successful_setting.rb
index 6eca4198..e24d29d6 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher/successful_setting.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher/successful_setting.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/disallow_value_matcher.rb b/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
index e6a50647..3b4ecbce 100644
--- a/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
+++ b/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_model/errors.rb b/lib/shoulda/matchers/active_model/errors.rb
index d8480430..daa7a890 100644
--- a/lib/shoulda/matchers/active_model/errors.rb
+++ b/lib/shoulda/matchers/active_model/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/have_secure_password_matcher.rb b/lib/shoulda/matchers/active_model/have_secure_password_matcher.rb
index e73a7549..6e15b24a 100644
--- a/lib/shoulda/matchers/active_model/have_secure_password_matcher.rb
+++ b/lib/shoulda/matchers/active_model/have_secure_password_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/helpers.rb b/lib/shoulda/matchers/active_model/helpers.rb
index cf2c5cf8..2f4d3793 100644
--- a/lib/shoulda/matchers/active_model/helpers.rb
+++ b/lib/shoulda/matchers/active_model/helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers.rb b/lib/shoulda/matchers/active_model/numericality_matchers.rb
index fe649c66..1d6429dd 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
index 8110a832..30df591e 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
index 167f2bc2..2d443928 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/numeric_type_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/numeric_type_matcher.rb
index 7197eba2..ccd926e1 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/numeric_type_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/numeric_type_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
index 8fdaaeae..35f9ab1a 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
index 42fd9fb6..4a409687 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/qualifiers.rb b/lib/shoulda/matchers/active_model/qualifiers.rb
index 7af3d448..149fbb70 100644
--- a/lib/shoulda/matchers/active_model/qualifiers.rb
+++ b/lib/shoulda/matchers/active_model/qualifiers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/qualifiers/allow_nil.rb b/lib/shoulda/matchers/active_model/qualifiers/allow_nil.rb
index 0e0bc30a..fdcf5b56 100644
--- a/lib/shoulda/matchers/active_model/qualifiers/allow_nil.rb
+++ b/lib/shoulda/matchers/active_model/qualifiers/allow_nil.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/qualifiers/ignore_interference_by_writer.rb b/lib/shoulda/matchers/active_model/qualifiers/ignore_interference_by_writer.rb
index 719d96b6..98927fc1 100644
--- a/lib/shoulda/matchers/active_model/qualifiers/ignore_interference_by_writer.rb
+++ b/lib/shoulda/matchers/active_model/qualifiers/ignore_interference_by_writer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/qualifiers/ignoring_interference_by_writer.rb b/lib/shoulda/matchers/active_model/qualifiers/ignoring_interference_by_writer.rb
index 31302f02..9d6bfd3a 100644
--- a/lib/shoulda/matchers/active_model/qualifiers/ignoring_interference_by_writer.rb
+++ b/lib/shoulda/matchers/active_model/qualifiers/ignoring_interference_by_writer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
index c78ddf6a..efde3ec9 100644
--- a/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_acceptance_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_acceptance_of_matcher.rb
index 7c2734a9..cfe8d5e8 100644
--- a/lib/shoulda/matchers/active_model/validate_acceptance_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_acceptance_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_confirmation_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_confirmation_of_matcher.rb
index 81e91bac..d2cdb9e2 100644
--- a/lib/shoulda/matchers/active_model/validate_confirmation_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_confirmation_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_exclusion_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_exclusion_of_matcher.rb
index 7016d071..bafea0b6 100644
--- a/lib/shoulda/matchers/active_model/validate_exclusion_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_exclusion_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
index 6ddb740f..880f138d 100644
--- a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bigdecimal'
 require 'date'
 
diff --git a/lib/shoulda/matchers/active_model/validate_length_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_length_of_matcher.rb
index a4032495..d15e92e9 100644
--- a/lib/shoulda/matchers/active_model/validate_length_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_length_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_numericality_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_numericality_of_matcher.rb
index a4281be7..c5d19642 100644
--- a/lib/shoulda/matchers/active_model/validate_numericality_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_numericality_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validate_presence_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_presence_of_matcher.rb
index de770b07..2a3bf826 100644
--- a/lib/shoulda/matchers/active_model/validate_presence_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_presence_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validation_matcher.rb b/lib/shoulda/matchers/active_model/validation_matcher.rb
index 3575999c..bd1d19fd 100644
--- a/lib/shoulda/matchers/active_model/validation_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validation_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validation_matcher/build_description.rb b/lib/shoulda/matchers/active_model/validation_matcher/build_description.rb
index 2fb1adf9..2e1aa310 100644
--- a/lib/shoulda/matchers/active_model/validation_matcher/build_description.rb
+++ b/lib/shoulda/matchers/active_model/validation_matcher/build_description.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validation_message_finder.rb b/lib/shoulda/matchers/active_model/validation_message_finder.rb
index 33d1305e..5abae8b8 100644
--- a/lib/shoulda/matchers/active_model/validation_message_finder.rb
+++ b/lib/shoulda/matchers/active_model/validation_message_finder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_model/validator.rb b/lib/shoulda/matchers/active_model/validator.rb
index 42643729..5fe7337b 100644
--- a/lib/shoulda/matchers/active_model/validator.rb
+++ b/lib/shoulda/matchers/active_model/validator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_record.rb b/lib/shoulda/matchers/active_record.rb
index 00d30a92..4706c3e0 100644
--- a/lib/shoulda/matchers/active_record.rb
+++ b/lib/shoulda/matchers/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "shoulda/matchers/active_record/association_matcher"
 require "shoulda/matchers/active_record/association_matchers"
 require "shoulda/matchers/active_record/association_matchers/counter_cache_matcher"
diff --git a/lib/shoulda/matchers/active_record/accept_nested_attributes_for_matcher.rb b/lib/shoulda/matchers/active_record/accept_nested_attributes_for_matcher.rb
index 737b0e52..ca477a7b 100644
--- a/lib/shoulda/matchers/active_record/accept_nested_attributes_for_matcher.rb
+++ b/lib/shoulda/matchers/active_record/accept_nested_attributes_for_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matcher.rb b/lib/shoulda/matchers/active_record/association_matcher.rb
index 5b122dec..ec8d4767 100644
--- a/lib/shoulda/matchers/active_record/association_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_support/core_ext/module/delegation'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_record/association_matchers.rb b/lib/shoulda/matchers/active_record/association_matchers.rb
index 802cb59b..424cfdd7 100644
--- a/lib/shoulda/matchers/active_record/association_matchers.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/counter_cache_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/counter_cache_matcher.rb
index 6866e3b9..d9ef5ef5 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/counter_cache_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/counter_cache_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/dependent_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/dependent_matcher.rb
index 973433a0..4d4ba776 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/dependent_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/dependent_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/inverse_of_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/inverse_of_matcher.rb
index ae9a5656..10c9845c 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/inverse_of_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/inverse_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/join_table_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/join_table_matcher.rb
index b214445f..3d7aef34 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/join_table_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/join_table_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/model_reflection.rb b/lib/shoulda/matchers/active_record/association_matchers/model_reflection.rb
index 882808f4..e5c847cb 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/model_reflection.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/model_reflection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_record/association_matchers/model_reflector.rb b/lib/shoulda/matchers/active_record/association_matchers/model_reflector.rb
index 0d0503c9..43dbbd92 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/model_reflector.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/model_reflector.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/option_verifier.rb b/lib/shoulda/matchers/active_record/association_matchers/option_verifier.rb
index 3ad93b76..0231380a 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/option_verifier.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/option_verifier.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/optional_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/optional_matcher.rb
index b6ab5755..50178b69 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/optional_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/optional_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/order_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/order_matcher.rb
index 08775955..8239598a 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/order_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/order_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/required_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/required_matcher.rb
index 9a84ebc4..d144c5de 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/required_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/required_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/source_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/source_matcher.rb
index 7985b003..9546b24c 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/source_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/source_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/association_matchers/through_matcher.rb b/lib/shoulda/matchers/active_record/association_matchers/through_matcher.rb
index 0569394a..ff2b9ace 100644
--- a/lib/shoulda/matchers/active_record/association_matchers/through_matcher.rb
+++ b/lib/shoulda/matchers/active_record/association_matchers/through_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/define_enum_for_matcher.rb b/lib/shoulda/matchers/active_record/define_enum_for_matcher.rb
index 6fd570e0..5c096836 100644
--- a/lib/shoulda/matchers/active_record/define_enum_for_matcher.rb
+++ b/lib/shoulda/matchers/active_record/define_enum_for_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/have_db_column_matcher.rb b/lib/shoulda/matchers/active_record/have_db_column_matcher.rb
index 98180f47..bcdf53dd 100644
--- a/lib/shoulda/matchers/active_record/have_db_column_matcher.rb
+++ b/lib/shoulda/matchers/active_record/have_db_column_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/have_db_index_matcher.rb b/lib/shoulda/matchers/active_record/have_db_index_matcher.rb
index 6cfe5d85..5db4c6c5 100644
--- a/lib/shoulda/matchers/active_record/have_db_index_matcher.rb
+++ b/lib/shoulda/matchers/active_record/have_db_index_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/have_readonly_attribute_matcher.rb b/lib/shoulda/matchers/active_record/have_readonly_attribute_matcher.rb
index aec93184..615d5234 100644
--- a/lib/shoulda/matchers/active_record/have_readonly_attribute_matcher.rb
+++ b/lib/shoulda/matchers/active_record/have_readonly_attribute_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/have_secure_token_matcher.rb b/lib/shoulda/matchers/active_record/have_secure_token_matcher.rb
index 693c7d8b..4c0a8365 100644
--- a/lib/shoulda/matchers/active_record/have_secure_token_matcher.rb
+++ b/lib/shoulda/matchers/active_record/have_secure_token_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/serialize_matcher.rb b/lib/shoulda/matchers/active_record/serialize_matcher.rb
index ca8965b0..6196a0f4 100644
--- a/lib/shoulda/matchers/active_record/serialize_matcher.rb
+++ b/lib/shoulda/matchers/active_record/serialize_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/uniqueness.rb b/lib/shoulda/matchers/active_record/uniqueness.rb
index db935631..6080a5cf 100644
--- a/lib/shoulda/matchers/active_record/uniqueness.rb
+++ b/lib/shoulda/matchers/active_record/uniqueness.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveModel
diff --git a/lib/shoulda/matchers/active_record/uniqueness/model.rb b/lib/shoulda/matchers/active_record/uniqueness/model.rb
index a5ce8487..63092459 100644
--- a/lib/shoulda/matchers/active_record/uniqueness/model.rb
+++ b/lib/shoulda/matchers/active_record/uniqueness/model.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/uniqueness/namespace.rb b/lib/shoulda/matchers/active_record/uniqueness/namespace.rb
index 65e6d3fd..08ec2fa8 100644
--- a/lib/shoulda/matchers/active_record/uniqueness/namespace.rb
+++ b/lib/shoulda/matchers/active_record/uniqueness/namespace.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/active_record/uniqueness/test_model_creator.rb b/lib/shoulda/matchers/active_record/uniqueness/test_model_creator.rb
index 78f86e34..b6c48351 100644
--- a/lib/shoulda/matchers/active_record/uniqueness/test_model_creator.rb
+++ b/lib/shoulda/matchers/active_record/uniqueness/test_model_creator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'thread'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_record/uniqueness/test_models.rb b/lib/shoulda/matchers/active_record/uniqueness/test_models.rb
index 2283af96..80b589ea 100644
--- a/lib/shoulda/matchers/active_record/uniqueness/test_models.rb
+++ b/lib/shoulda/matchers/active_record/uniqueness/test_models.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'thread'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/active_record/validate_uniqueness_of_matcher.rb b/lib/shoulda/matchers/active_record/validate_uniqueness_of_matcher.rb
index a0084fd5..69569fa5 100644
--- a/lib/shoulda/matchers/active_record/validate_uniqueness_of_matcher.rb
+++ b/lib/shoulda/matchers/active_record/validate_uniqueness_of_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module ActiveRecord
diff --git a/lib/shoulda/matchers/configuration.rb b/lib/shoulda/matchers/configuration.rb
index fd988d1f..cec1bc4a 100644
--- a/lib/shoulda/matchers/configuration.rb
+++ b/lib/shoulda/matchers/configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/doublespeak.rb b/lib/shoulda/matchers/doublespeak.rb
index e09b0082..a37c7897 100644
--- a/lib/shoulda/matchers/doublespeak.rb
+++ b/lib/shoulda/matchers/doublespeak.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/doublespeak/double.rb b/lib/shoulda/matchers/doublespeak/double.rb
index 13fbbbf8..f6b59d97 100644
--- a/lib/shoulda/matchers/doublespeak/double.rb
+++ b/lib/shoulda/matchers/doublespeak/double.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/double_collection.rb b/lib/shoulda/matchers/doublespeak/double_collection.rb
index 43d4f003..85e8b767 100644
--- a/lib/shoulda/matchers/doublespeak/double_collection.rb
+++ b/lib/shoulda/matchers/doublespeak/double_collection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/double_implementation_registry.rb b/lib/shoulda/matchers/doublespeak/double_implementation_registry.rb
index 71e43e1d..d89d85fa 100644
--- a/lib/shoulda/matchers/doublespeak/double_implementation_registry.rb
+++ b/lib/shoulda/matchers/doublespeak/double_implementation_registry.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/method_call.rb b/lib/shoulda/matchers/doublespeak/method_call.rb
index 9323cf40..088d2808 100644
--- a/lib/shoulda/matchers/doublespeak/method_call.rb
+++ b/lib/shoulda/matchers/doublespeak/method_call.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/object_double.rb b/lib/shoulda/matchers/doublespeak/object_double.rb
index 17b27af4..bb0ebea0 100644
--- a/lib/shoulda/matchers/doublespeak/object_double.rb
+++ b/lib/shoulda/matchers/doublespeak/object_double.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/proxy_implementation.rb b/lib/shoulda/matchers/doublespeak/proxy_implementation.rb
index 6168d3e4..322f3a6f 100644
--- a/lib/shoulda/matchers/doublespeak/proxy_implementation.rb
+++ b/lib/shoulda/matchers/doublespeak/proxy_implementation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/stub_implementation.rb b/lib/shoulda/matchers/doublespeak/stub_implementation.rb
index acb125d1..84266893 100644
--- a/lib/shoulda/matchers/doublespeak/stub_implementation.rb
+++ b/lib/shoulda/matchers/doublespeak/stub_implementation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/doublespeak/world.rb b/lib/shoulda/matchers/doublespeak/world.rb
index 3c046a3c..276c61d0 100644
--- a/lib/shoulda/matchers/doublespeak/world.rb
+++ b/lib/shoulda/matchers/doublespeak/world.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Doublespeak
diff --git a/lib/shoulda/matchers/error.rb b/lib/shoulda/matchers/error.rb
index e2b9f6b5..efe8474a 100644
--- a/lib/shoulda/matchers/error.rb
+++ b/lib/shoulda/matchers/error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/independent.rb b/lib/shoulda/matchers/independent.rb
index 3996e023..1be462a7 100644
--- a/lib/shoulda/matchers/independent.rb
+++ b/lib/shoulda/matchers/independent.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/independent/delegate_method_matcher'
 require 'shoulda/matchers/independent/delegate_method_matcher/stubbed_target'
 require 'shoulda/matchers/independent/delegate_method_matcher/target_not_defined_error'
diff --git a/lib/shoulda/matchers/independent/delegate_method_matcher.rb b/lib/shoulda/matchers/independent/delegate_method_matcher.rb
index 31fd5231..03e29357 100644
--- a/lib/shoulda/matchers/independent/delegate_method_matcher.rb
+++ b/lib/shoulda/matchers/independent/delegate_method_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/doublespeak'
 require 'shoulda/matchers/matcher_context'
 
diff --git a/lib/shoulda/matchers/independent/delegate_method_matcher/stubbed_target.rb b/lib/shoulda/matchers/independent/delegate_method_matcher/stubbed_target.rb
index c2c6f449..2c6f17d5 100644
--- a/lib/shoulda/matchers/independent/delegate_method_matcher/stubbed_target.rb
+++ b/lib/shoulda/matchers/independent/delegate_method_matcher/stubbed_target.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Independent
diff --git a/lib/shoulda/matchers/independent/delegate_method_matcher/target_not_defined_error.rb b/lib/shoulda/matchers/independent/delegate_method_matcher/target_not_defined_error.rb
index 0f003975..aab74565 100644
--- a/lib/shoulda/matchers/independent/delegate_method_matcher/target_not_defined_error.rb
+++ b/lib/shoulda/matchers/independent/delegate_method_matcher/target_not_defined_error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Independent
diff --git a/lib/shoulda/matchers/integrations.rb b/lib/shoulda/matchers/integrations.rb
index dc7ad4ed..e29a6266 100644
--- a/lib/shoulda/matchers/integrations.rb
+++ b/lib/shoulda/matchers/integrations.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/integrations/configuration.rb b/lib/shoulda/matchers/integrations/configuration.rb
index 78f7953e..7307d7d1 100644
--- a/lib/shoulda/matchers/integrations/configuration.rb
+++ b/lib/shoulda/matchers/integrations/configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/integrations/configuration_error.rb b/lib/shoulda/matchers/integrations/configuration_error.rb
index 1132b564..0796d09a 100644
--- a/lib/shoulda/matchers/integrations/configuration_error.rb
+++ b/lib/shoulda/matchers/integrations/configuration_error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/inclusion.rb b/lib/shoulda/matchers/integrations/inclusion.rb
index 7f446fc8..727129fc 100644
--- a/lib/shoulda/matchers/integrations/inclusion.rb
+++ b/lib/shoulda/matchers/integrations/inclusion.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries.rb b/lib/shoulda/matchers/integrations/libraries.rb
index c3724642..8fdc177c 100644
--- a/lib/shoulda/matchers/integrations/libraries.rb
+++ b/lib/shoulda/matchers/integrations/libraries.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/integrations/libraries/action_controller'
 require 'shoulda/matchers/integrations/libraries/active_model'
 require 'shoulda/matchers/integrations/libraries/active_record'
diff --git a/lib/shoulda/matchers/integrations/libraries/action_controller.rb b/lib/shoulda/matchers/integrations/libraries/action_controller.rb
index 5d3a1fe4..789b5dae 100644
--- a/lib/shoulda/matchers/integrations/libraries/action_controller.rb
+++ b/lib/shoulda/matchers/integrations/libraries/action_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries/active_model.rb b/lib/shoulda/matchers/integrations/libraries/active_model.rb
index 0d88b35e..dac77e71 100644
--- a/lib/shoulda/matchers/integrations/libraries/active_model.rb
+++ b/lib/shoulda/matchers/integrations/libraries/active_model.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries/active_record.rb b/lib/shoulda/matchers/integrations/libraries/active_record.rb
index f04fe1ed..bae17c73 100644
--- a/lib/shoulda/matchers/integrations/libraries/active_record.rb
+++ b/lib/shoulda/matchers/integrations/libraries/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries/missing_library.rb b/lib/shoulda/matchers/integrations/libraries/missing_library.rb
index c1ea89a9..56252216 100644
--- a/lib/shoulda/matchers/integrations/libraries/missing_library.rb
+++ b/lib/shoulda/matchers/integrations/libraries/missing_library.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries/rails.rb b/lib/shoulda/matchers/integrations/libraries/rails.rb
index 6deade23..3a31347d 100644
--- a/lib/shoulda/matchers/integrations/libraries/rails.rb
+++ b/lib/shoulda/matchers/integrations/libraries/rails.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/libraries/routing.rb b/lib/shoulda/matchers/integrations/libraries/routing.rb
index 3399c22b..3ba07bcb 100644
--- a/lib/shoulda/matchers/integrations/libraries/routing.rb
+++ b/lib/shoulda/matchers/integrations/libraries/routing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/rails.rb b/lib/shoulda/matchers/integrations/rails.rb
index d28dedf1..be811035 100644
--- a/lib/shoulda/matchers/integrations/rails.rb
+++ b/lib/shoulda/matchers/integrations/rails.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/registry.rb b/lib/shoulda/matchers/integrations/registry.rb
index 80836e6e..7a868cbd 100644
--- a/lib/shoulda/matchers/integrations/registry.rb
+++ b/lib/shoulda/matchers/integrations/registry.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks.rb b/lib/shoulda/matchers/integrations/test_frameworks.rb
index d7e80016..a6e4e8e5 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/integrations/test_frameworks/active_support_test_case'
 require 'shoulda/matchers/integrations/test_frameworks/minitest_4'
 require 'shoulda/matchers/integrations/test_frameworks/minitest_5'
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/active_support_test_case.rb b/lib/shoulda/matchers/integrations/test_frameworks/active_support_test_case.rb
index 90dce71e..f1075652 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/active_support_test_case.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/active_support_test_case.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb b/lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb
index 1351b8af..2120c3e7 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb b/lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb
index 14553fd9..3c3cfee8 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/missing_test_framework.rb b/lib/shoulda/matchers/integrations/test_frameworks/missing_test_framework.rb
index 0a5f8c55..62be7860 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/missing_test_framework.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/missing_test_framework.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/rspec.rb b/lib/shoulda/matchers/integrations/test_frameworks/rspec.rb
index 3fd6d617..74eb6b36 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/rspec.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/rspec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb b/lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb
index 951c1df5..41f044ba 100644
--- a/lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb
+++ b/lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     module Integrations
diff --git a/lib/shoulda/matchers/matcher_context.rb b/lib/shoulda/matchers/matcher_context.rb
index 16ef8bd1..7f60a498 100644
--- a/lib/shoulda/matchers/matcher_context.rb
+++ b/lib/shoulda/matchers/matcher_context.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/rails_shim.rb b/lib/shoulda/matchers/rails_shim.rb
index 929b6485..d1719e82 100644
--- a/lib/shoulda/matchers/rails_shim.rb
+++ b/lib/shoulda/matchers/rails_shim.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/routing.rb b/lib/shoulda/matchers/routing.rb
index 7f57df79..5ee42d48 100644
--- a/lib/shoulda/matchers/routing.rb
+++ b/lib/shoulda/matchers/routing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/util.rb b/lib/shoulda/matchers/util.rb
index 37737a9d..c1f102b8 100644
--- a/lib/shoulda/matchers/util.rb
+++ b/lib/shoulda/matchers/util.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/util/word_wrap'
 
 module Shoulda
diff --git a/lib/shoulda/matchers/util/word_wrap.rb b/lib/shoulda/matchers/util/word_wrap.rb
index 8f6077d2..4ff7ece8 100644
--- a/lib/shoulda/matchers/util/word_wrap.rb
+++ b/lib/shoulda/matchers/util/word_wrap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/version.rb b/lib/shoulda/matchers/version.rb
index 373e9d82..00af36da 100644
--- a/lib/shoulda/matchers/version.rb
+++ b/lib/shoulda/matchers/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/lib/shoulda/matchers/warn.rb b/lib/shoulda/matchers/warn.rb
index b0f45af3..5455f64e 100644
--- a/lib/shoulda/matchers/warn.rb
+++ b/lib/shoulda/matchers/warn.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Shoulda
   module Matchers
     # @private
diff --git a/script/supported_ruby_versions b/script/supported_ruby_versions
index 003e2b1c..744d76a4 100755
--- a/script/supported_ruby_versions
+++ b/script/supported_ruby_versions
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'yaml'
 
diff --git a/shoulda-matchers.gemspec b/shoulda-matchers.gemspec
index 752579a3..50c05ce8 100644
--- a/shoulda-matchers.gemspec
+++ b/shoulda-matchers.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH << File.join(File.dirname(__FILE__), 'lib')
 require 'shoulda/matchers/version'
 
diff --git a/spec/acceptance/active_model_integration_spec.rb b/spec/acceptance/active_model_integration_spec.rb
index 1c9042e9..80b9ac6d 100644
--- a/spec/acceptance/active_model_integration_spec.rb
+++ b/spec/acceptance/active_model_integration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'acceptance_spec_helper'
 
 describe 'shoulda-matchers integrates with an ActiveModel project' do
diff --git a/spec/acceptance/independent_matchers_spec.rb b/spec/acceptance/independent_matchers_spec.rb
index 59e3c889..d6ef1c01 100644
--- a/spec/acceptance/independent_matchers_spec.rb
+++ b/spec/acceptance/independent_matchers_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'acceptance_spec_helper'
 
 describe 'shoulda-matchers has independent matchers, specifically delegate_method' do
diff --git a/spec/acceptance/multiple_libraries_integration_spec.rb b/spec/acceptance/multiple_libraries_integration_spec.rb
index 376e1291..e6af20c1 100644
--- a/spec/acceptance/multiple_libraries_integration_spec.rb
+++ b/spec/acceptance/multiple_libraries_integration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'acceptance_spec_helper'
 
 describe 'shoulda-matchers integrates with multiple libraries' do
diff --git a/spec/acceptance/rails_integration_spec.rb b/spec/acceptance/rails_integration_spec.rb
index 79d6e197..8e407e0f 100644
--- a/spec/acceptance/rails_integration_spec.rb
+++ b/spec/acceptance/rails_integration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'acceptance_spec_helper'
 
 describe 'shoulda-matchers integrates with Rails' do
diff --git a/spec/acceptance_spec_helper.rb b/spec/acceptance_spec_helper.rb
index f1022c79..f0519466 100644
--- a/spec/acceptance_spec_helper.rb
+++ b/spec/acceptance_spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'support/tests/current_bundle'
 
 Tests::CurrentBundle.instance.assert_appraisal!
diff --git a/spec/doublespeak_spec_helper.rb b/spec/doublespeak_spec_helper.rb
index 58f03ea7..8cbbd686 100644
--- a/spec/doublespeak_spec_helper.rb
+++ b/spec/doublespeak_spec_helper.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 require 'shoulda/matchers/doublespeak'
 require 'spec_helper'
diff --git a/spec/report_warnings.rb b/spec/report_warnings.rb
index b6f0fc08..d758d3c4 100644
--- a/spec/report_warnings.rb
+++ b/spec/report_warnings.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path('../warnings_spy', __FILE__)
 
 # Adapted from <http://myronmars.to/n/dev-blog/2011/08/making-your-gem-warning-free>
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index b7f73972..c8b9286d 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 PROJECT_ROOT = File.expand_path('../..', __FILE__)
 $LOAD_PATH << File.join(PROJECT_ROOT, 'lib')
 
diff --git a/spec/support/acceptance/adds_shoulda_matchers_to_project.rb b/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
index c684e196..fb266c6f 100644
--- a/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
+++ b/spec/support/acceptance/adds_shoulda_matchers_to_project.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'helpers/base_helpers'
 require_relative 'helpers/rspec_helpers'
 
diff --git a/spec/support/acceptance/helpers.rb b/spec/support/acceptance/helpers.rb
index c09a1dfa..6f446636 100644
--- a/spec/support/acceptance/helpers.rb
+++ b/spec/support/acceptance/helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'helpers/active_model_helpers'
 require_relative 'helpers/base_helpers'
 require_relative 'helpers/command_helpers'
diff --git a/spec/support/acceptance/helpers/active_model_helpers.rb b/spec/support/acceptance/helpers/active_model_helpers.rb
index e218c2a2..e7b36b2f 100644
--- a/spec/support/acceptance/helpers/active_model_helpers.rb
+++ b/spec/support/acceptance/helpers/active_model_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'gem_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/array_helpers.rb b/spec/support/acceptance/helpers/array_helpers.rb
index e9d3b2eb..c06de554 100644
--- a/spec/support/acceptance/helpers/array_helpers.rb
+++ b/spec/support/acceptance/helpers/array_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module AcceptanceTests
   module ArrayHelpers
     def to_sentence(array)
diff --git a/spec/support/acceptance/helpers/base_helpers.rb b/spec/support/acceptance/helpers/base_helpers.rb
index 98383b56..8d5846ff 100644
--- a/spec/support/acceptance/helpers/base_helpers.rb
+++ b/spec/support/acceptance/helpers/base_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../tests/bundle'
 require_relative '../../tests/database'
 require_relative '../../tests/filesystem'
diff --git a/spec/support/acceptance/helpers/command_helpers.rb b/spec/support/acceptance/helpers/command_helpers.rb
index f833a6fe..a06145ff 100644
--- a/spec/support/acceptance/helpers/command_helpers.rb
+++ b/spec/support/acceptance/helpers/command_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'base_helpers'
 require_relative '../../tests/command_runner'
 
diff --git a/spec/support/acceptance/helpers/file_helpers.rb b/spec/support/acceptance/helpers/file_helpers.rb
index adb98bf3..89aa4141 100644
--- a/spec/support/acceptance/helpers/file_helpers.rb
+++ b/spec/support/acceptance/helpers/file_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'base_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/gem_helpers.rb b/spec/support/acceptance/helpers/gem_helpers.rb
index e3c3d542..38eccb2b 100644
--- a/spec/support/acceptance/helpers/gem_helpers.rb
+++ b/spec/support/acceptance/helpers/gem_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'base_helpers'
 require_relative 'command_helpers'
 require_relative 'file_helpers'
diff --git a/spec/support/acceptance/helpers/minitest_helpers.rb b/spec/support/acceptance/helpers/minitest_helpers.rb
index a27c2fa1..61809450 100644
--- a/spec/support/acceptance/helpers/minitest_helpers.rb
+++ b/spec/support/acceptance/helpers/minitest_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'gem_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/n_unit_helpers.rb b/spec/support/acceptance/helpers/n_unit_helpers.rb
index 3429aec2..99b74db3 100644
--- a/spec/support/acceptance/helpers/n_unit_helpers.rb
+++ b/spec/support/acceptance/helpers/n_unit_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'rails_version_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/pluralization_helpers.rb b/spec/support/acceptance/helpers/pluralization_helpers.rb
index 9aacd7ae..efb18d26 100644
--- a/spec/support/acceptance/helpers/pluralization_helpers.rb
+++ b/spec/support/acceptance/helpers/pluralization_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module AcceptanceTests
   module PluralizationHelpers
     def pluralize(count, singular_version, plural_version = nil)
diff --git a/spec/support/acceptance/helpers/rails_migration_helpers.rb b/spec/support/acceptance/helpers/rails_migration_helpers.rb
index 211bc01b..d6bd6cfb 100644
--- a/spec/support/acceptance/helpers/rails_migration_helpers.rb
+++ b/spec/support/acceptance/helpers/rails_migration_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'gem_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/rails_version_helpers.rb b/spec/support/acceptance/helpers/rails_version_helpers.rb
index 02f20711..34729983 100644
--- a/spec/support/acceptance/helpers/rails_version_helpers.rb
+++ b/spec/support/acceptance/helpers/rails_version_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'gem_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/rspec_helpers.rb b/spec/support/acceptance/helpers/rspec_helpers.rb
index 875a9115..0edc3f2d 100644
--- a/spec/support/acceptance/helpers/rspec_helpers.rb
+++ b/spec/support/acceptance/helpers/rspec_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'gem_helpers'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/ruby_version_helpers.rb b/spec/support/acceptance/helpers/ruby_version_helpers.rb
index 8725944b..4c561538 100644
--- a/spec/support/acceptance/helpers/ruby_version_helpers.rb
+++ b/spec/support/acceptance/helpers/ruby_version_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../tests/version'
 
 module AcceptanceTests
diff --git a/spec/support/acceptance/helpers/step_helpers.rb b/spec/support/acceptance/helpers/step_helpers.rb
index b399f60a..3440d093 100644
--- a/spec/support/acceptance/helpers/step_helpers.rb
+++ b/spec/support/acceptance/helpers/step_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'file_helpers'
 require_relative 'gem_helpers'
 require_relative 'minitest_helpers'
diff --git a/spec/support/acceptance/matchers/have_output.rb b/spec/support/acceptance/matchers/have_output.rb
index 4f8e60e0..c2edf9ec 100644
--- a/spec/support/acceptance/matchers/have_output.rb
+++ b/spec/support/acceptance/matchers/have_output.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module AcceptanceTests
   module Matchers
     def have_output(output)
diff --git a/spec/support/acceptance/matchers/indicate_number_of_tests_was_run_matcher.rb b/spec/support/acceptance/matchers/indicate_number_of_tests_was_run_matcher.rb
index 7ca88c8f..c400b7fe 100644
--- a/spec/support/acceptance/matchers/indicate_number_of_tests_was_run_matcher.rb
+++ b/spec/support/acceptance/matchers/indicate_number_of_tests_was_run_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../helpers/pluralization_helpers'
 require_relative '../helpers/rails_version_helpers'
 
diff --git a/spec/support/acceptance/matchers/indicate_that_tests_were_run_matcher.rb b/spec/support/acceptance/matchers/indicate_that_tests_were_run_matcher.rb
index f8488431..70d8b6b6 100644
--- a/spec/support/acceptance/matchers/indicate_that_tests_were_run_matcher.rb
+++ b/spec/support/acceptance/matchers/indicate_that_tests_were_run_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../helpers/array_helpers'
 require_relative '../helpers/pluralization_helpers'
 require_relative '../helpers/rails_version_helpers'
diff --git a/spec/support/tests/bundle.rb b/spec/support/tests/bundle.rb
index 5042c910..8b653678 100644
--- a/spec/support/tests/bundle.rb
+++ b/spec/support/tests/bundle.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'filesystem'
 require_relative 'command_runner'
 require_relative 'version'
diff --git a/spec/support/tests/command_runner.rb b/spec/support/tests/command_runner.rb
index 45798d4a..ec803b41 100644
--- a/spec/support/tests/command_runner.rb
+++ b/spec/support/tests/command_runner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'timeout'
 require 'shellwords'
 
diff --git a/spec/support/tests/current_bundle.rb b/spec/support/tests/current_bundle.rb
index 80a08cd9..c015b45a 100644
--- a/spec/support/tests/current_bundle.rb
+++ b/spec/support/tests/current_bundle.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler'
 require 'appraisal'
 
diff --git a/spec/support/tests/database.rb b/spec/support/tests/database.rb
index 34061c3f..ce8cec90 100644
--- a/spec/support/tests/database.rb
+++ b/spec/support/tests/database.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'database_configuration'
 
 module Tests
diff --git a/spec/support/tests/database_adapters/postgresql.rb b/spec/support/tests/database_adapters/postgresql.rb
index bd3b2110..1a9b54f3 100644
--- a/spec/support/tests/database_adapters/postgresql.rb
+++ b/spec/support/tests/database_adapters/postgresql.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Tests
   module DatabaseAdapters
     class PostgreSQL
diff --git a/spec/support/tests/database_adapters/sqlite3.rb b/spec/support/tests/database_adapters/sqlite3.rb
index 1ae8edd7..69742347 100644
--- a/spec/support/tests/database_adapters/sqlite3.rb
+++ b/spec/support/tests/database_adapters/sqlite3.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Tests
   module DatabaseAdapters
     class SQLite3
diff --git a/spec/support/tests/database_configuration.rb b/spec/support/tests/database_configuration.rb
index fed22753..19e8b3f5 100644
--- a/spec/support/tests/database_configuration.rb
+++ b/spec/support/tests/database_configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'database_configuration_registry'
 require 'delegate'
 
diff --git a/spec/support/tests/database_configuration_registry.rb b/spec/support/tests/database_configuration_registry.rb
index 76a8676b..1e87f11a 100644
--- a/spec/support/tests/database_configuration_registry.rb
+++ b/spec/support/tests/database_configuration_registry.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'singleton'
 
 module Tests
diff --git a/spec/support/tests/filesystem.rb b/spec/support/tests/filesystem.rb
index b269a5a1..0dfa64cd 100644
--- a/spec/support/tests/filesystem.rb
+++ b/spec/support/tests/filesystem.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'fileutils'
 
 module Tests
diff --git a/spec/support/tests/version.rb b/spec/support/tests/version.rb
index 4a2a66e4..c0d8891a 100644
--- a/spec/support/tests/version.rb
+++ b/spec/support/tests/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Tests
   class Version
     def initialize(version)
diff --git a/spec/support/unit/active_record/create_table.rb b/spec/support/unit/active_record/create_table.rb
index 25dde568..1085c644 100644
--- a/spec/support/unit/active_record/create_table.rb
+++ b/spec/support/unit/active_record/create_table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../helpers/active_record_versions'
 require_relative '../helpers/database_helpers'
 
diff --git a/spec/support/unit/attribute.rb b/spec/support/unit/attribute.rb
index 21f6cb11..14ec157b 100644
--- a/spec/support/unit/attribute.rb
+++ b/spec/support/unit/attribute.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   class Attribute
     DEFAULT_COLUMN_TYPE = :string
diff --git a/spec/support/unit/capture.rb b/spec/support/unit/capture.rb
index a5879954..1995810e 100644
--- a/spec/support/unit/capture.rb
+++ b/spec/support/unit/capture.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Kernel
   # #capture, #silence_stream, and #silence_stderr are deprecated after Rails
   # 4.2 and will be removed in 5.0, so just override them completely here
diff --git a/spec/support/unit/change_value.rb b/spec/support/unit/change_value.rb
index 404fc686..d8eda458 100644
--- a/spec/support/unit/change_value.rb
+++ b/spec/support/unit/change_value.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   class ChangeValue
     def self.call(column_type, value, value_changer)
diff --git a/spec/support/unit/create_model_arguments/basic.rb b/spec/support/unit/create_model_arguments/basic.rb
index 7c0c4c78..28898133 100644
--- a/spec/support/unit/create_model_arguments/basic.rb
+++ b/spec/support/unit/create_model_arguments/basic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module UnitTests
diff --git a/spec/support/unit/create_model_arguments/has_many.rb b/spec/support/unit/create_model_arguments/has_many.rb
index c37d457a..7eb33527 100644
--- a/spec/support/unit/create_model_arguments/has_many.rb
+++ b/spec/support/unit/create_model_arguments/has_many.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module CreateModelArguments
     class HasMany < Basic
diff --git a/spec/support/unit/create_model_arguments/uniqueness_matcher.rb b/spec/support/unit/create_model_arguments/uniqueness_matcher.rb
index e2691346..01e135cc 100644
--- a/spec/support/unit/create_model_arguments/uniqueness_matcher.rb
+++ b/spec/support/unit/create_model_arguments/uniqueness_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module CreateModelArguments
     class UniquenessMatcher < Basic
diff --git a/spec/support/unit/helpers/action_pack_versions.rb b/spec/support/unit/helpers/action_pack_versions.rb
index 5e6b77fa..3db27a54 100644
--- a/spec/support/unit/helpers/action_pack_versions.rb
+++ b/spec/support/unit/helpers/action_pack_versions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ActionPackVersions
     extend self
diff --git a/spec/support/unit/helpers/active_model_helpers.rb b/spec/support/unit/helpers/active_model_helpers.rb
index 4f5bbc79..176226c6 100644
--- a/spec/support/unit/helpers/active_model_helpers.rb
+++ b/spec/support/unit/helpers/active_model_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ActiveModelHelpers
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/active_model_versions.rb b/spec/support/unit/helpers/active_model_versions.rb
index 15468cf2..b1f82d8f 100644
--- a/spec/support/unit/helpers/active_model_versions.rb
+++ b/spec/support/unit/helpers/active_model_versions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ActiveModelVersions
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/active_record_versions.rb b/spec/support/unit/helpers/active_record_versions.rb
index 3cbde9cf..dbcd6a57 100644
--- a/spec/support/unit/helpers/active_record_versions.rb
+++ b/spec/support/unit/helpers/active_record_versions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ActiveRecordVersions
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/active_resource_builder.rb b/spec/support/unit/helpers/active_resource_builder.rb
index ea60d70b..2c74ab45 100644
--- a/spec/support/unit/helpers/active_resource_builder.rb
+++ b/spec/support/unit/helpers/active_resource_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ActiveResourceBuilder
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/allow_value_matcher_helpers.rb b/spec/support/unit/helpers/allow_value_matcher_helpers.rb
index c4143989..c9b36166 100644
--- a/spec/support/unit/helpers/allow_value_matcher_helpers.rb
+++ b/spec/support/unit/helpers/allow_value_matcher_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../record_with_different_error_attribute_builder'
 require_relative '../record_builder_with_i18n_validation_message'
 
diff --git a/spec/support/unit/helpers/application_configuration_helpers.rb b/spec/support/unit/helpers/application_configuration_helpers.rb
index 87d013bc..f8e7eaf3 100644
--- a/spec/support/unit/helpers/application_configuration_helpers.rb
+++ b/spec/support/unit/helpers/application_configuration_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ApplicationConfigurationHelpers
     def with_belongs_to_as_required_by_default(&block)
diff --git a/spec/support/unit/helpers/class_builder.rb b/spec/support/unit/helpers/class_builder.rb
index 3d1477b5..28a133cc 100644
--- a/spec/support/unit/helpers/class_builder.rb
+++ b/spec/support/unit/helpers/class_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ClassBuilder
     def define_module(*args, &block)
diff --git a/spec/support/unit/helpers/column_type_helpers.rb b/spec/support/unit/helpers/column_type_helpers.rb
index fe7faa2f..dae5ac68 100644
--- a/spec/support/unit/helpers/column_type_helpers.rb
+++ b/spec/support/unit/helpers/column_type_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ColumnTypeHelpers
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/confirmation_matcher_helpers.rb b/spec/support/unit/helpers/confirmation_matcher_helpers.rb
index 70933203..cd5a41d8 100644
--- a/spec/support/unit/helpers/confirmation_matcher_helpers.rb
+++ b/spec/support/unit/helpers/confirmation_matcher_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../record_validating_confirmation_builder'
 require_relative '../record_builder_with_i18n_validation_message'
 
diff --git a/spec/support/unit/helpers/controller_builder.rb b/spec/support/unit/helpers/controller_builder.rb
index e5e651a8..fce229a9 100644
--- a/spec/support/unit/helpers/controller_builder.rb
+++ b/spec/support/unit/helpers/controller_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ControllerBuilder
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/database_helpers.rb b/spec/support/unit/helpers/database_helpers.rb
index 24a19497..e7645cd7 100644
--- a/spec/support/unit/helpers/database_helpers.rb
+++ b/spec/support/unit/helpers/database_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module DatabaseHelpers
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/i18n_faker.rb b/spec/support/unit/helpers/i18n_faker.rb
index a693d114..7cde5218 100644
--- a/spec/support/unit/helpers/i18n_faker.rb
+++ b/spec/support/unit/helpers/i18n_faker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module I18nFaker
     extend self
diff --git a/spec/support/unit/helpers/mailer_builder.rb b/spec/support/unit/helpers/mailer_builder.rb
index 9e284f03..39ff976a 100644
--- a/spec/support/unit/helpers/mailer_builder.rb
+++ b/spec/support/unit/helpers/mailer_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module MailerBuilder
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/helpers/message_helpers.rb b/spec/support/unit/helpers/message_helpers.rb
index 67203387..4b561326 100644
--- a/spec/support/unit/helpers/message_helpers.rb
+++ b/spec/support/unit/helpers/message_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module MessageHelpers
     include Shoulda::Matchers::WordWrap
diff --git a/spec/support/unit/helpers/model_builder.rb b/spec/support/unit/helpers/model_builder.rb
index e2e44ebb..5937afbc 100644
--- a/spec/support/unit/helpers/model_builder.rb
+++ b/spec/support/unit/helpers/model_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'class_builder'
 
 module UnitTests
diff --git a/spec/support/unit/helpers/rails_versions.rb b/spec/support/unit/helpers/rails_versions.rb
index 2b578739..1146b31c 100644
--- a/spec/support/unit/helpers/rails_versions.rb
+++ b/spec/support/unit/helpers/rails_versions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module RailsVersions
     extend self
diff --git a/spec/support/unit/helpers/validation_matcher_scenario_helpers.rb b/spec/support/unit/helpers/validation_matcher_scenario_helpers.rb
index 8e5579a9..919e9bb7 100644
--- a/spec/support/unit/helpers/validation_matcher_scenario_helpers.rb
+++ b/spec/support/unit/helpers/validation_matcher_scenario_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ValidationMatcherScenarioHelpers
     def self.configure_example_group(example_group)
diff --git a/spec/support/unit/i18n.rb b/spec/support/unit/i18n.rb
index 3f461484..85830d3f 100644
--- a/spec/support/unit/i18n.rb
+++ b/spec/support/unit/i18n.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 RSpec.configure do |config|
   config.after do
     # Clear any translations added during tests by telling the backend to
diff --git a/spec/support/unit/load_environment.rb b/spec/support/unit/load_environment.rb
index e4dface3..2b63db55 100644
--- a/spec/support/unit/load_environment.rb
+++ b/spec/support/unit/load_environment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../tests/current_bundle'
 require_relative 'rails_application'
 
diff --git a/spec/support/unit/matchers/deprecate.rb b/spec/support/unit/matchers/deprecate.rb
index 37527b63..660d7c8f 100644
--- a/spec/support/unit/matchers/deprecate.rb
+++ b/spec/support/unit/matchers/deprecate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module Matchers
     def deprecate(old_method, new_method)
diff --git a/spec/support/unit/matchers/fail_with_message_including_matcher.rb b/spec/support/unit/matchers/fail_with_message_including_matcher.rb
index 8c1e4006..db6c9329 100644
--- a/spec/support/unit/matchers/fail_with_message_including_matcher.rb
+++ b/spec/support/unit/matchers/fail_with_message_including_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module Matchers
     extend RSpec::Matchers::DSL
diff --git a/spec/support/unit/matchers/fail_with_message_matcher.rb b/spec/support/unit/matchers/fail_with_message_matcher.rb
index c86783d5..03d31bd7 100644
--- a/spec/support/unit/matchers/fail_with_message_matcher.rb
+++ b/spec/support/unit/matchers/fail_with_message_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module Matchers
     extend RSpec::Matchers::DSL
diff --git a/spec/support/unit/matchers/match_against.rb b/spec/support/unit/matchers/match_against.rb
index 76cf1ee4..97fb1a78 100644
--- a/spec/support/unit/matchers/match_against.rb
+++ b/spec/support/unit/matchers/match_against.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module Matchers
     def match_against(object)
diff --git a/spec/support/unit/matchers/print_warning_including.rb b/spec/support/unit/matchers/print_warning_including.rb
index 03577b2d..fff4f356 100644
--- a/spec/support/unit/matchers/print_warning_including.rb
+++ b/spec/support/unit/matchers/print_warning_including.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module Matchers
     def print_warning_including(expected_warning)
diff --git a/spec/support/unit/model_creation_strategies/active_model.rb b/spec/support/unit/model_creation_strategies/active_model.rb
index 45b5f755..af4906cf 100644
--- a/spec/support/unit/model_creation_strategies/active_model.rb
+++ b/spec/support/unit/model_creation_strategies/active_model.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ModelCreationStrategies
     class ActiveModel
diff --git a/spec/support/unit/model_creation_strategies/active_record.rb b/spec/support/unit/model_creation_strategies/active_record.rb
index 54dcc37e..a354b229 100644
--- a/spec/support/unit/model_creation_strategies/active_record.rb
+++ b/spec/support/unit/model_creation_strategies/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ModelCreationStrategies
     class ActiveRecord
diff --git a/spec/support/unit/model_creators.rb b/spec/support/unit/model_creators.rb
index 60274c7d..4e34f588 100644
--- a/spec/support/unit/model_creators.rb
+++ b/spec/support/unit/model_creators.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnitTests
   module ModelCreators
     class << self
diff --git a/spec/support/unit/model_creators/active_model.rb b/spec/support/unit/model_creators/active_model.rb
index dd0d6801..d5d5f75e 100644
--- a/spec/support/unit/model_creators/active_model.rb
+++ b/spec/support/unit/model_creators/active_model.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../model_creators'
 require 'forwardable'
 
diff --git a/spec/support/unit/model_creators/active_record.rb b/spec/support/unit/model_creators/active_record.rb
index 23898a19..c548172e 100644
--- a/spec/support/unit/model_creators/active_record.rb
+++ b/spec/support/unit/model_creators/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../model_creators'
 require 'forwardable'
 
diff --git a/spec/support/unit/model_creators/active_record/has_and_belongs_to_many.rb b/spec/support/unit/model_creators/active_record/has_and_belongs_to_many.rb
index 267c0a66..adbbe781 100644
--- a/spec/support/unit/model_creators/active_record/has_and_belongs_to_many.rb
+++ b/spec/support/unit/model_creators/active_record/has_and_belongs_to_many.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../model_creators'
 require 'forwardable'
 
diff --git a/spec/support/unit/model_creators/active_record/has_many.rb b/spec/support/unit/model_creators/active_record/has_many.rb
index 77d293d4..7e8210a7 100644
--- a/spec/support/unit/model_creators/active_record/has_many.rb
+++ b/spec/support/unit/model_creators/active_record/has_many.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../model_creators'
 require 'forwardable'
 
diff --git a/spec/support/unit/model_creators/active_record/uniqueness_matcher.rb b/spec/support/unit/model_creators/active_record/uniqueness_matcher.rb
index cd23ce02..8d1d9cf0 100644
--- a/spec/support/unit/model_creators/active_record/uniqueness_matcher.rb
+++ b/spec/support/unit/model_creators/active_record/uniqueness_matcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../model_creators'
 require 'forwardable'
 
diff --git a/spec/support/unit/model_creators/basic.rb b/spec/support/unit/model_creators/basic.rb
index 1d549c5a..22b335fd 100644
--- a/spec/support/unit/model_creators/basic.rb
+++ b/spec/support/unit/model_creators/basic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module UnitTests
diff --git a/spec/support/unit/rails_application.rb b/spec/support/unit/rails_application.rb
index 2f5d5dc7..32bd7707 100644
--- a/spec/support/unit/rails_application.rb
+++ b/spec/support/unit/rails_application.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../tests/bundle'
 require_relative '../tests/command_runner'
 require_relative '../tests/database'
diff --git a/spec/support/unit/record_builder_with_i18n_validation_message.rb b/spec/support/unit/record_builder_with_i18n_validation_message.rb
index 1cc1d2ab..ef38f845 100644
--- a/spec/support/unit/record_builder_with_i18n_validation_message.rb
+++ b/spec/support/unit/record_builder_with_i18n_validation_message.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module UnitTests
diff --git a/spec/support/unit/record_validating_confirmation_builder.rb b/spec/support/unit/record_validating_confirmation_builder.rb
index da32262c..c6078e93 100644
--- a/spec/support/unit/record_validating_confirmation_builder.rb
+++ b/spec/support/unit/record_validating_confirmation_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'helpers/model_builder'
 
 module UnitTests
diff --git a/spec/support/unit/record_with_different_error_attribute_builder.rb b/spec/support/unit/record_with_different_error_attribute_builder.rb
index d6405b72..dda7d1fa 100644
--- a/spec/support/unit/record_with_different_error_attribute_builder.rb
+++ b/spec/support/unit/record_with_different_error_attribute_builder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'helpers/model_builder'
 
 module UnitTests
diff --git a/spec/support/unit/shared_examples/ignoring_interference_by_writer.rb b/spec/support/unit/shared_examples/ignoring_interference_by_writer.rb
index 2fc45360..c95c56ce 100644
--- a/spec/support/unit/shared_examples/ignoring_interference_by_writer.rb
+++ b/spec/support/unit/shared_examples/ignoring_interference_by_writer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples_for 'ignoring_interference_by_writer' do |common_config|
   valid_tests = [
     :accept_if_qualified_but_changing_value_does_not_interfere,
diff --git a/spec/support/unit/shared_examples/numerical_submatcher.rb b/spec/support/unit/shared_examples/numerical_submatcher.rb
index 9ac97772..491755d8 100644
--- a/spec/support/unit/shared_examples/numerical_submatcher.rb
+++ b/spec/support/unit/shared_examples/numerical_submatcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples 'a numerical submatcher' do
   it 'implements the with_message method' do
     expect(subject).to respond_to(:with_message).with(1).arguments
diff --git a/spec/support/unit/shared_examples/set_session_or_flash.rb b/spec/support/unit/shared_examples/set_session_or_flash.rb
index dbd4f08c..03868bd5 100644
--- a/spec/support/unit/shared_examples/set_session_or_flash.rb
+++ b/spec/support/unit/shared_examples/set_session_or_flash.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples_for 'set session or flash matcher' do
   context 'without any qualifiers' do
     it 'produces the right description' do
diff --git a/spec/support/unit/validation_matcher_scenario.rb b/spec/support/unit/validation_matcher_scenario.rb
index 0a356756..a4d4ccc5 100644
--- a/spec/support/unit/validation_matcher_scenario.rb
+++ b/spec/support/unit/validation_matcher_scenario.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module UnitTests
diff --git a/spec/unit/shoulda/matchers/action_controller/callback_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/callback_matcher_spec.rb
index 81b8249b..04f77010 100644
--- a/spec/unit/shoulda/matchers/action_controller/callback_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/callback_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::CallbackMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/filter_param_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/filter_param_matcher_spec.rb
index 084bfd4c..1a4601c1 100644
--- a/spec/unit/shoulda/matchers/action_controller/filter_param_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/filter_param_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::FilterParamMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/permit_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/permit_matcher_spec.rb
index 509a9bbd..e69cf7b6 100644
--- a/spec/unit/shoulda/matchers/action_controller/permit_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/permit_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::PermitMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/redirect_to_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/redirect_to_matcher_spec.rb
index 31311043..36026be4 100644
--- a/spec/unit/shoulda/matchers/action_controller/redirect_to_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/redirect_to_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RedirectToMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/render_template_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/render_template_matcher_spec.rb
index 1ad1cde7..474c5fd6 100644
--- a/spec/unit/shoulda/matchers/action_controller/render_template_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/render_template_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RenderTemplateMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/render_with_layout_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/render_with_layout_matcher_spec.rb
index 571d633e..4dbc6511 100644
--- a/spec/unit/shoulda/matchers/action_controller/render_with_layout_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/render_with_layout_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RenderWithLayoutMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/rescue_from_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/rescue_from_matcher_spec.rb
index 4e281d66..22348b50 100644
--- a/spec/unit/shoulda/matchers/action_controller/rescue_from_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/rescue_from_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RescueFromMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/respond_with_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/respond_with_matcher_spec.rb
index ef5b4e5d..c58dc1b8 100644
--- a/spec/unit/shoulda/matchers/action_controller/respond_with_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/respond_with_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RespondWithMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/route_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/route_matcher_spec.rb
index db397221..76dd5f55 100644
--- a/spec/unit/shoulda/matchers/action_controller/route_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/route_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe 'Shoulda::Matchers::ActionController::RouteMatcher', type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/route_params_spec.rb b/spec/unit/shoulda/matchers/action_controller/route_params_spec.rb
index dcc34816..3407373c 100644
--- a/spec/unit/shoulda/matchers/action_controller/route_params_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/route_params_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::RouteParams, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/set_flash_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/set_flash_matcher_spec.rb
index cb74a31a..bb849219 100644
--- a/spec/unit/shoulda/matchers/action_controller/set_flash_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/set_flash_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::SetFlashMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/set_session_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/set_session_matcher_spec.rb
index c9556502..fd87d671 100644
--- a/spec/unit/shoulda/matchers/action_controller/set_session_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/set_session_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::SetSessionMatcher, type: :controller do
diff --git a/spec/unit/shoulda/matchers/action_controller/set_session_or_flash_matcher_spec.rb b/spec/unit/shoulda/matchers/action_controller/set_session_or_flash_matcher_spec.rb
index a7fa58c6..04faee90 100644
--- a/spec/unit/shoulda/matchers/action_controller/set_session_or_flash_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/action_controller/set_session_or_flash_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActionController::SetSessionOrFlashMatcher do
diff --git a/spec/unit/shoulda/matchers/active_model/allow_mass_assignment_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/allow_mass_assignment_of_matcher_spec.rb
index 3c374f3c..9f53c4c8 100644
--- a/spec/unit/shoulda/matchers/active_model/allow_mass_assignment_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/allow_mass_assignment_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::AllowMassAssignmentOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
index a44435ca..74444549 100644
--- a/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/disallow_value_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/disallow_value_matcher_spec.rb
index 436204aa..e1022d1f 100644
--- a/spec/unit/shoulda/matchers/active_model/disallow_value_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/disallow_value_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::DisallowValueMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/have_secure_password_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/have_secure_password_matcher_spec.rb
index d3add54f..9df80096 100644
--- a/spec/unit/shoulda/matchers/active_model/have_secure_password_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/have_secure_password_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::HaveSecurePasswordMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/helpers_spec.rb b/spec/unit/shoulda/matchers/active_model/helpers_spec.rb
index b8178054..564d02e5 100644
--- a/spec/unit/shoulda/matchers/active_model/helpers_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/helpers_spec.rb
@@ -1,4 +1,6 @@
 # encoding: UTF-8
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::Helpers do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_absence_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_absence_of_matcher_spec.rb
index 54627853..9c6f5051 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_absence_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_absence_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateAbsenceOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
index 8cabdd36..1068b11b 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateAcceptanceOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_confirmation_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_confirmation_of_matcher_spec.rb
index ef01fe1c..36144a63 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_confirmation_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_confirmation_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateConfirmationOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_exclusion_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_exclusion_of_matcher_spec.rb
index 899316d3..3ec5a201 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_exclusion_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_exclusion_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateExclusionOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb
index bc18c2d5..b86fd3a7 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateInclusionOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_length_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_length_of_matcher_spec.rb
index 3cdf2c0f..0a8c0a12 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_length_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_length_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateLengthOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
index 6d492f01..d0ebba49 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_model/validate_presence_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_presence_of_matcher_spec.rb
index 49c12e1f..cab84537 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_presence_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_presence_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveModel::ValidatePresenceOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/accept_nested_attributes_for_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/accept_nested_attributes_for_matcher_spec.rb
index 7b3da7da..d4039340 100644
--- a/spec/unit/shoulda/matchers/active_record/accept_nested_attributes_for_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/accept_nested_attributes_for_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::AcceptNestedAttributesForMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/association_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/association_matcher_spec.rb
index 29f5a20a..3cbebf0d 100644
--- a/spec/unit/shoulda/matchers/active_record/association_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/association_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::AssociationMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/association_matchers/model_reflection_spec.rb b/spec/unit/shoulda/matchers/active_record/association_matchers/model_reflection_spec.rb
index 6be80728..e7c17c7f 100644
--- a/spec/unit/shoulda/matchers/active_record/association_matchers/model_reflection_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/association_matchers/model_reflection_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::AssociationMatchers::ModelReflection do
diff --git a/spec/unit/shoulda/matchers/active_record/define_enum_for_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/define_enum_for_matcher_spec.rb
index 8b3517f6..ae7be8ed 100644
--- a/spec/unit/shoulda/matchers/active_record/define_enum_for_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/define_enum_for_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::DefineEnumForMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/have_db_column_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/have_db_column_matcher_spec.rb
index 1d23259a..e970b716 100644
--- a/spec/unit/shoulda/matchers/active_record/have_db_column_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/have_db_column_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::HaveDbColumnMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb
index 2c1025c5..f4cf8c87 100644
--- a/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::HaveDbIndexMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/have_readonly_attributes_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/have_readonly_attributes_matcher_spec.rb
index 9a43887f..1dd70017 100644
--- a/spec/unit/shoulda/matchers/active_record/have_readonly_attributes_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/have_readonly_attributes_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::HaveReadonlyAttributeMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/have_secure_token_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/have_secure_token_matcher_spec.rb
index bb2ac9ee..b762ce2e 100644
--- a/spec/unit/shoulda/matchers/active_record/have_secure_token_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/have_secure_token_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 # rubocop:disable Metrics/BlockLength
diff --git a/spec/unit/shoulda/matchers/active_record/serialize_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/serialize_matcher_spec.rb
index 07cc1d36..1387ffb6 100644
--- a/spec/unit/shoulda/matchers/active_record/serialize_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/serialize_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::SerializeMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/active_record/validate_uniqueness_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/validate_uniqueness_of_matcher_spec.rb
index f39ef957..2bc60fdb 100644
--- a/spec/unit/shoulda/matchers/active_record/validate_uniqueness_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_record/validate_uniqueness_of_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::ActiveRecord::ValidateUniquenessOfMatcher, type: :model do
diff --git a/spec/unit/shoulda/matchers/doublespeak/double_collection_spec.rb b/spec/unit/shoulda/matchers/doublespeak/double_collection_spec.rb
index 88be260a..0a31876a 100644
--- a/spec/unit/shoulda/matchers/doublespeak/double_collection_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/double_collection_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/double_implementation_registry_spec.rb b/spec/unit/shoulda/matchers/doublespeak/double_implementation_registry_spec.rb
index 2e4d87da..d22ead4e 100644
--- a/spec/unit/shoulda/matchers/doublespeak/double_implementation_registry_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/double_implementation_registry_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/double_spec.rb b/spec/unit/shoulda/matchers/doublespeak/double_spec.rb
index 737e20da..5705f9d2 100644
--- a/spec/unit/shoulda/matchers/doublespeak/double_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/double_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/object_double_spec.rb b/spec/unit/shoulda/matchers/doublespeak/object_double_spec.rb
index e63b5335..e9e60b4c 100644
--- a/spec/unit/shoulda/matchers/doublespeak/object_double_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/object_double_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/proxy_implementation_spec.rb b/spec/unit/shoulda/matchers/doublespeak/proxy_implementation_spec.rb
index d733780b..50e2dd6b 100644
--- a/spec/unit/shoulda/matchers/doublespeak/proxy_implementation_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/proxy_implementation_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/stub_implementation_spec.rb b/spec/unit/shoulda/matchers/doublespeak/stub_implementation_spec.rb
index 4500b3b8..247cc7a9 100644
--- a/spec/unit/shoulda/matchers/doublespeak/stub_implementation_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/stub_implementation_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak/world_spec.rb b/spec/unit/shoulda/matchers/doublespeak/world_spec.rb
index 9b0ae96a..0af6cde5 100644
--- a/spec/unit/shoulda/matchers/doublespeak/world_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak/world_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers::Doublespeak
diff --git a/spec/unit/shoulda/matchers/doublespeak_spec.rb b/spec/unit/shoulda/matchers/doublespeak_spec.rb
index c64fab63..a37c8037 100644
--- a/spec/unit/shoulda/matchers/doublespeak_spec.rb
+++ b/spec/unit/shoulda/matchers/doublespeak_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'doublespeak_spec_helper'
 
 module Shoulda::Matchers
diff --git a/spec/unit/shoulda/matchers/independent/delegate_method_matcher/stubbed_target_spec.rb b/spec/unit/shoulda/matchers/independent/delegate_method_matcher/stubbed_target_spec.rb
index f44dcbf5..d68af217 100644
--- a/spec/unit/shoulda/matchers/independent/delegate_method_matcher/stubbed_target_spec.rb
+++ b/spec/unit/shoulda/matchers/independent/delegate_method_matcher/stubbed_target_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::Independent::DelegateMethodMatcher::StubbedTarget do
diff --git a/spec/unit/shoulda/matchers/independent/delegate_method_matcher_spec.rb b/spec/unit/shoulda/matchers/independent/delegate_method_matcher_spec.rb
index 80e952ec..0d864459 100644
--- a/spec/unit/shoulda/matchers/independent/delegate_method_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/independent/delegate_method_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe Shoulda::Matchers::Independent::DelegateMethodMatcher do
diff --git a/spec/unit/shoulda/matchers/routing/route_matcher_spec.rb b/spec/unit/shoulda/matchers/routing/route_matcher_spec.rb
index 38f56023..40ba8272 100644
--- a/spec/unit/shoulda/matchers/routing/route_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/routing/route_matcher_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'unit_spec_helper'
 
 describe 'Shoulda::Matchers::Routing::RouteMatcher', type: :routing do
diff --git a/spec/unit/shoulda/matchers/util/word_wrap_spec.rb b/spec/unit/shoulda/matchers/util/word_wrap_spec.rb
index 7e9f62aa..547ca6c5 100644
--- a/spec/unit/shoulda/matchers/util/word_wrap_spec.rb
+++ b/spec/unit/shoulda/matchers/util/word_wrap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'shoulda/matchers/util/word_wrap'
 
diff --git a/spec/unit_spec_helper.rb b/spec/unit_spec_helper.rb
index 080eb913..98672309 100644
--- a/spec/unit_spec_helper.rb
+++ b/spec/unit_spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'support/unit/load_environment'
 
 require 'rspec/rails'
diff --git a/spec/warnings_spy.rb b/spec/warnings_spy.rb
index 9dae2dde..f1bf6389 100644
--- a/spec/warnings_spy.rb
+++ b/spec/warnings_spy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 require File.expand_path('../warnings_spy/filesystem', __FILE__)
diff --git a/spec/warnings_spy/filesystem.rb b/spec/warnings_spy/filesystem.rb
index 75306814..780e4413 100644
--- a/spec/warnings_spy/filesystem.rb
+++ b/spec/warnings_spy/filesystem.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'fileutils'
 
 class WarningsSpy
diff --git a/spec/warnings_spy/partitioner.rb b/spec/warnings_spy/partitioner.rb
index c6a70531..af4d3bd8 100644
--- a/spec/warnings_spy/partitioner.rb
+++ b/spec/warnings_spy/partitioner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 class WarningsSpy
diff --git a/spec/warnings_spy/reader.rb b/spec/warnings_spy/reader.rb
index 5dfcde09..f04f25b8 100644
--- a/spec/warnings_spy/reader.rb
+++ b/spec/warnings_spy/reader.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WarningsSpy
   class Reader
     attr_reader :warning_groups
diff --git a/spec/warnings_spy/reporter.rb b/spec/warnings_spy/reporter.rb
index 5eff50eb..86d905b3 100644
--- a/spec/warnings_spy/reporter.rb
+++ b/spec/warnings_spy/reporter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 class WarningsSpy
diff --git a/tasks/documentation.rb b/tasks/documentation.rb
index e0d5289a..8914e318 100644
--- a/tasks/documentation.rb
+++ b/tasks/documentation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../lib/shoulda/matchers/version'
 require 'erb'