From 68a9d6367e1bb4e095b78555c16955e9ce612832 Mon Sep 17 00:00:00 2001
From: Ashik Salman <ashiksp@gmail.com>
Date: Sat, 24 Apr 2021 23:16:43 +0530
Subject: [PATCH] Used double quotes in template file for consistency.

---
 .../active_record/model/templates/model.rb.tt |  2 +-
 .../model/templates/module.rb.tt              |  4 +-
 railties/lib/rails/generators/actions.rb      |  4 +-
 railties/lib/rails/generators/app_base.rb     |  2 +-
 railties/lib/rails/generators/app_name.rb     |  2 +-
 .../generators/rails/app/templates/Gemfile.tt | 42 ++++++------
 .../templates/config/databases/jdbc.yml.tt    |  4 +-
 .../config/databases/jdbcmysql.yml.tt         |  6 +-
 .../config/databases/jdbcpostgresql.yml.tt    |  6 +-
 .../config/databases/jdbcsqlite3.yml.tt       |  4 +-
 .../templates/config/databases/mysql.yml.tt   |  6 +-
 .../templates/config/databases/oracle.yml.tt  |  4 +-
 .../config/databases/postgresql.yml.tt        |  6 +-
 .../templates/config/databases/sqlite3.yml.tt |  2 +-
 .../config/databases/sqlserver.yml.tt         | 10 +--
 .../application_controller_renderer.rb.tt     |  2 +-
 .../templates/config/initializers/cors.rb.tt  |  4 +-
 .../config/initializers/inflections.rb.tt     |  8 +--
 .../rails/app/templates/config/locales/en.yml |  6 +-
 .../rails/app/templates/db/seeds.rb.tt        |  4 +-
 .../db/system/change/change_generator.rb      |  2 +-
 .../templates/%file_name%_generator.rb.tt     |  2 +-
 .../rails/plugin/plugin_generator.rb          |  4 +-
 .../rails/plugin/templates/%name%.gemspec.tt  |  4 +-
 .../rails/plugin/templates/Gemfile.tt         | 16 ++---
 .../rails/plugin/templates/README.md.tt       |  2 +-
 .../application_mailer.rb.tt                  |  4 +-
 .../lib/%namespaced_name%/engine.rb.tt        |  4 +-
 .../lib/%namespaced_name%/version.rb.tt       |  2 +-
 .../rails/plugin/templates/rails/boot.rb.tt   |  4 +-
 .../plugin/templates/test/test_helper.rb.tt   |  6 +-
 .../generator/templates/generator_test.rb.tt  |  2 +-
 .../test_unit/model/templates/fixtures.yml.tt |  4 +-
 .../test_unit/scaffold/scaffold_generator.rb  |  2 +-
 .../templates/api_functional_test.rb.tt       |  4 +-
 .../scaffold/templates/functional_test.rb.tt  |  4 +-
 .../lib/rails/generators/testing/behaviour.rb |  2 +-
 railties/test/generators/actions_test.rb      | 66 +++++++++----------
 .../test/generators/api_app_generator_test.rb | 12 ++--
 .../test/generators/app_generator_test.rb     | 26 ++++----
 .../generators/benchmark_generator_test.rb    |  4 +-
 .../db_system_change_generator_test.rb        |  8 +--
 .../test/generators/model_generator_test.rb   |  2 +-
 .../generators/namespaced_generators_test.rb  |  2 +-
 .../test/generators/plugin_generator_test.rb  | 28 ++++----
 .../generators/scaffold_generator_test.rb     | 10 +--
 railties/test/railties/generators_test.rb     |  2 +-
 47 files changed, 178 insertions(+), 178 deletions(-)

diff --git a/activerecord/lib/rails/generators/active_record/model/templates/model.rb.tt b/activerecord/lib/rails/generators/active_record/model/templates/model.rb.tt
index 77b9ea1c86..e2c7e4e1f8 100644
--- a/activerecord/lib/rails/generators/active_record/model/templates/model.rb.tt
+++ b/activerecord/lib/rails/generators/active_record/model/templates/model.rb.tt
@@ -1,7 +1,7 @@
 <% module_namespacing do -%>
 class <%= class_name %> < <%= parent_class_name.classify %>
 <% attributes.select(&:reference?).each do |attribute| -%>
-  belongs_to :<%= attribute.name %><%= ', polymorphic: true' if attribute.polymorphic? %>
+  belongs_to :<%= attribute.name %><%= ", polymorphic: true" if attribute.polymorphic? %>
 <% end -%>
 <% attributes.select(&:rich_text?).each do |attribute| -%>
   has_rich_text :<%= attribute.name %>
diff --git a/activerecord/lib/rails/generators/active_record/model/templates/module.rb.tt b/activerecord/lib/rails/generators/active_record/model/templates/module.rb.tt
index a3bf1c37b6..a38f8b93e2 100644
--- a/activerecord/lib/rails/generators/active_record/model/templates/module.rb.tt
+++ b/activerecord/lib/rails/generators/active_record/model/templates/module.rb.tt
@@ -1,7 +1,7 @@
 <% module_namespacing do -%>
-module <%= class_path.map(&:camelize).join('::') %>
+module <%= class_path.map(&:camelize).join("::") %>
   def self.table_name_prefix
-    '<%= namespaced? ? namespaced_class_path.join('_') : class_path.join('_') %>_'
+    "<%= namespaced? ? namespaced_class_path.join("_") : class_path.join("_") %>_"
   end
 end
 <% end -%>
diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index cdf7b0e509..bbf5b10d44 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -334,9 +334,9 @@ module Rails
           return value.inspect unless value.is_a? String
 
           if value.include?("'")
-            value.inspect
+            value.tr("'", '"')
           else
-            "'#{value}'"
+            "\"#{value}\""
           end
         end
 
diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index 4a8361b29a..3280d722fd 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -257,7 +257,7 @@ module Rails
           version = super
 
           if version.is_a?(Array)
-            version.join("', '")
+            version.join('", "')
           else
             version
           end
diff --git a/railties/lib/rails/generators/app_name.rb b/railties/lib/rails/generators/app_name.rb
index 5bb735c4e8..1ca21bed78 100644
--- a/railties/lib/rails/generators/app_name.rb
+++ b/railties/lib/rails/generators/app_name.rb
@@ -7,7 +7,7 @@ module Rails
 
       private
         def app_name
-          @app_name ||= original_app_name.tr('\\', "").tr("-. ", "_")
+          @app_name ||= original_app_name.tr("\\", "").tr("-. ", "_")
         end
 
         def original_app_name
diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile.tt b/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
index e3e7099814..dffc0dd922 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
@@ -1,7 +1,7 @@
-source 'https://rubygems.org'
+source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby <%= "'#{RUBY_VERSION}'" -%>
+ruby <%= "\"#{RUBY_VERSION}\"" -%>
 
 <% unless gemfile_entries.first&.comment -%>
 
@@ -11,68 +11,68 @@ ruby <%= "'#{RUBY_VERSION}'" -%>
 
 # <%= gem.comment %>
 <% end -%>
-<%= gem.commented_out ? '# ' : '' %>gem '<%= gem.name %>'<%= %(, '#{gem.version}') if gem.version -%>
+<%= gem.commented_out ? "# " : "" %>gem "<%= gem.name %>"<%= %(, "#{gem.version}") if gem.version -%>
 <% if gem.options.any? -%>
 , <%= gem.options.map { |k,v|
-  "#{k}: #{v.inspect.gsub('"', '\'')}" }.join(', ') %>
+  "#{k}: #{v.inspect.gsub('"', '\'')}" }.join(", ") %>
 <% end -%>
 <% end -%>
 
 # Use Active Model has_secure_password
-# gem 'bcrypt', '~> 3.1.7'
+# gem "bcrypt", "~> 3.1.7"
 <% unless skip_active_storage? -%>
 
 # Use Active Storage variant
-# gem 'image_processing', '~> 1.2'
+# gem "image_processing", "~> 1.2"
 <% end -%>
 
 <% if depend_on_bootsnap? -%>
 # Reduces boot times through caching; required in config/boot.rb
-gem 'bootsnap', '>= 1.4.4', require: false
+gem "bootsnap", ">= 1.4.4", require: false
 
 <%- end -%>
 <%- if options.api? -%>
 # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
-# gem 'rack-cors'
+# gem "rack-cors"
 
 <%- end -%>
-<% if RUBY_ENGINE == 'ruby' -%>
+<% if RUBY_ENGINE == "ruby" -%>
 group :development, :test do
-  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
-  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
+  # Call "byebug" anywhere in the code to stop execution and get a debugger console
+  gem "byebug", platforms: [:mri, :mingw, :x64_mingw]
 end
 
 <% end -%>
 group :development do
 <%- unless options.api? || options.skip_dev_gems? -%>
-  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
+  # Access an interactive console on exception pages or by calling "console" anywhere in the code.
   <%- if options.dev? || options.edge? || options.main? -%>
-  gem 'web-console', github: 'rails/web-console'
+  gem "web-console", github: "rails/web-console"
   <%- else -%>
-  gem 'web-console', '>= 4.1.0'
+  gem "web-console", ">= 4.1.0"
   <%- end -%>
   # Display performance information such as SQL time and flame graphs for each request in your browser.
   # Can be configured to work on production as well see: https://github.com/MiniProfiler/rack-mini-profiler/blob/master/README.md
-  gem 'rack-mini-profiler', '~> 2.0'
+  gem "rack-mini-profiler", "~> 2.0"
 <%- end -%>
 <% if depend_on_listen? -%>
-  gem 'listen', '~> 3.3'
+  gem "listen", "~> 3.3"
 <% end -%>
 <% if spring_install? -%>
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
-  gem 'spring'
+  gem "spring"
 <% end -%>
 end
 
 <%- if depends_on_system_test? -%>
 group :test do
   # Adds support for Capybara system testing and selenium driver
-  gem 'capybara', '>= 3.26'
-  gem 'selenium-webdriver'
+  gem "capybara", ">= 3.26"
+  gem "selenium-webdriver"
   # Easy installation and use of web drivers to run system tests with browsers
-  gem 'webdrivers'
+  gem "webdrivers"
 end
 
 <%- end -%>
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbc.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbc.yml.tt
index d0956a89d7..ed87606749 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbc.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbc.yml.tt
@@ -3,7 +3,7 @@
 #   gem install activerecord-jdbcmssql-adapter
 #
 # Configure using Gemfile:
-#   gem 'activerecord-jdbcmssql-adapter'
+#   gem "activerecord-jdbcmssql-adapter"
 #
 # development:
 #   adapter: mssql
@@ -65,4 +65,4 @@ test:
 production:
   url: jdbc:db://localhost/<%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt
index 6d3cf09d3c..7b3b100e42 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt
@@ -4,7 +4,7 @@
 #   gem install activerecord-jdbcmysql-adapter
 #
 # Configure Using Gemfile
-# gem 'activerecord-jdbcmysql-adapter'
+# gem "activerecord-jdbcmysql-adapter"
 #
 # And be sure to use new-style password hashing:
 #   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
@@ -42,7 +42,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -51,4 +51,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcpostgresql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcpostgresql.yml.tt
index a4ca9707f8..40261ec9fa 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcpostgresql.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcpostgresql.yml.tt
@@ -1,7 +1,7 @@
 # PostgreSQL. Versions 9.3 and up are supported.
 #
 # Configure Using Gemfile
-# gem 'activerecord-jdbcpostgresql-adapter'
+# gem "activerecord-jdbcpostgresql-adapter"
 #
 default: &default
   adapter: postgresql
@@ -58,7 +58,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -67,4 +67,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcsqlite3.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcsqlite3.yml.tt
index 006b0a74c3..701073c7fd 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcsqlite3.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcsqlite3.yml.tt
@@ -1,8 +1,8 @@
 # SQLite. Versions 3.8.0 and up are supported.
-#   gem 'activerecord-jdbcsqlite3-adapter'
+#   gem "activerecord-jdbcsqlite3-adapter"
 #
 # Configure Using Gemfile
-# gem 'activerecord-jdbcsqlite3-adapter'
+# gem "activerecord-jdbcsqlite3-adapter"
 #
 default: &default
   adapter: sqlite3
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/mysql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/mysql.yml.tt
index c446fc2dda..c0b48fae02 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/mysql.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/mysql.yml.tt
@@ -4,7 +4,7 @@
 #   gem install mysql2
 #
 # Ensure the MySQL gem is defined in your Gemfile
-#   gem 'mysql2'
+#   gem "mysql2"
 #
 # And be sure to use new-style password hashing:
 #   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
@@ -47,7 +47,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -56,4 +56,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/oracle.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/oracle.yml.tt
index 2be2bf21d3..c1a28185fe 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/oracle.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/oracle.yml.tt
@@ -50,7 +50,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -59,4 +59,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
index 6b2c5682b2..ff822417ab 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
@@ -12,7 +12,7 @@
 #       Install PostgreSQL and put its /bin directory on your path.
 #
 # Configure Using Gemfile
-# gem 'pg'
+# gem "pg"
 #
 default: &default
   adapter: postgresql
@@ -74,7 +74,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -83,4 +83,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml.tt
index a7c2bf2eac..0e1b55b674 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml.tt
@@ -2,7 +2,7 @@
 #   gem install sqlite3
 #
 #   Ensure the SQLite 3 gem is defined in your Gemfile
-#   gem 'sqlite3'
+#   gem "sqlite3"
 #
 default: &default
   adapter: sqlite3
diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/sqlserver.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/sqlserver.yml.tt
index 65cc8cdfd3..22a4863367 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/sqlserver.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/sqlserver.yml.tt
@@ -5,14 +5,14 @@
 #   gem install activerecord-sqlserver-adapter
 #
 # Ensure the activerecord adapter and db driver gems are defined in your Gemfile
-#   gem 'tiny_tds'
-#   gem 'activerecord-sqlserver-adapter'
+#   gem "tiny_tds"
+#   gem "activerecord-sqlserver-adapter"
 #
 default: &default
   adapter: sqlserver
   encoding: utf8
   username: sa
-  password: <%%= ENV['SA_PASSWORD'] %>
+  password: <%%= ENV["SA_PASSWORD"] %>
   host: localhost
 
 development:
@@ -41,7 +41,7 @@ test:
 # URL environment variable explicitly:
 #
 #   production:
-#     url: <%%= ENV['MY_APP_DATABASE_URL'] %>
+#     url: <%%= ENV["MY_APP_DATABASE_URL"] %>
 #
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
@@ -50,4 +50,4 @@ production:
   <<: *default
   database: <%= app_name %>_production
   username: <%= app_name %>
-  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>
+  password: <%%= ENV["<%= app_name.upcase %>_DATABASE_PASSWORD"] %>
diff --git a/railties/lib/rails/generators/rails/app/templates/config/initializers/application_controller_renderer.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/initializers/application_controller_renderer.rb.tt
index 89d2efab2b..05f1fb0e3c 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/initializers/application_controller_renderer.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/initializers/application_controller_renderer.rb.tt
@@ -2,7 +2,7 @@
 
 # ActiveSupport::Reloader.to_prepare do
 #   ApplicationController.renderer.defaults.merge!(
-#     http_host: 'example.org',
+#     http_host: "example.org",
 #     https: false
 #   )
 # end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/initializers/cors.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/initializers/cors.rb.tt
index 3b1c1b5ed1..e5a82f162c 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/initializers/cors.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/initializers/cors.rb.tt
@@ -7,9 +7,9 @@
 
 # Rails.application.config.middleware.insert_before 0, Rack::Cors do
 #   allow do
-#     origins 'example.com'
+#     origins "example.com"
 #
-#     resource '*',
+#     resource "*",
 #       headers: :any,
 #       methods: [:get, :post, :put, :patch, :delete, :options, :head]
 #   end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/initializers/inflections.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/initializers/inflections.rb.tt
index ac033bf9dc..ceb4902f3c 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/initializers/inflections.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/initializers/inflections.rb.tt
@@ -4,13 +4,13 @@
 # are locale specific, and you may define rules for as many different
 # locales as you wish. All of these examples are active by default:
 # ActiveSupport::Inflector.inflections(:en) do |inflect|
-#   inflect.plural /^(ox)$/i, '\1en'
-#   inflect.singular /^(ox)en/i, '\1'
-#   inflect.irregular 'person', 'people'
+#   inflect.plural /^(ox)$/i, "\1en"
+#   inflect.singular /^(ox)en/i, "\1"
+#   inflect.irregular "person", "people"
 #   inflect.uncountable %w( fish sheep )
 # end
 
 # These inflection rules are supported but not enabled by default:
 # ActiveSupport::Inflector.inflections(:en) do |inflect|
-#   inflect.acronym 'RESTful'
+#   inflect.acronym "RESTful"
 # end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/locales/en.yml b/railties/lib/rails/generators/rails/app/templates/config/locales/en.yml
index cf9b342d0a..8ca56fc74f 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/locales/en.yml
+++ b/railties/lib/rails/generators/rails/app/templates/config/locales/en.yml
@@ -4,11 +4,11 @@
 #
 # To use the locales, use `I18n.t`:
 #
-#     I18n.t 'hello'
+#     I18n.t "hello"
 #
 # In views, this is aliased to just `t`:
 #
-#     <%= t('hello') %>
+#     <%= t("hello") %>
 #
 # To use a different locale, set it with `I18n.locale`:
 #
@@ -24,7 +24,7 @@
 # Instead, surround them with single quotes.
 #
 # en:
-#   'true': 'foo'
+#   "true": "foo"
 #
 # To learn more, please read the Rails Internationalization guide
 # available at https://guides.rubyonrails.org/i18n.html.
diff --git a/railties/lib/rails/generators/rails/app/templates/db/seeds.rb.tt b/railties/lib/rails/generators/rails/app/templates/db/seeds.rb.tt
index f3a0480d18..bc25fce306 100644
--- a/railties/lib/rails/generators/rails/app/templates/db/seeds.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/db/seeds.rb.tt
@@ -3,5 +3,5 @@
 #
 # Examples:
 #
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)
+#   movies = Movie.create([{ name: "Star Wars" }, { name: "Lord of the Rings" }])
+#   Character.create(name: "Luke", movie: movies.first)
diff --git a/railties/lib/rails/generators/rails/db/system/change/change_generator.rb b/railties/lib/rails/generators/rails/db/system/change/change_generator.rb
index 24db92fad7..3187c66ad7 100644
--- a/railties/lib/rails/generators/rails/db/system/change/change_generator.rb
+++ b/railties/lib/rails/generators/rails/db/system/change/change_generator.rb
@@ -55,7 +55,7 @@ module Rails
             end
 
             def gem_entry_for(*gem_name_and_version)
-              gem_name_and_version.map! { |segment| "'#{segment}'" }
+              gem_name_and_version.map! { |segment| "\"#{segment}\"" }
               "gem #{gem_name_and_version.join(", ")}"
             end
         end
diff --git a/railties/lib/rails/generators/rails/generator/templates/%file_name%_generator.rb.tt b/railties/lib/rails/generators/rails/generator/templates/%file_name%_generator.rb.tt
index 178d5c3f9f..766bd3f381 100644
--- a/railties/lib/rails/generators/rails/generator/templates/%file_name%_generator.rb.tt
+++ b/railties/lib/rails/generators/rails/generator/templates/%file_name%_generator.rb.tt
@@ -1,3 +1,3 @@
 class <%= class_name %>Generator < Rails::Generators::NamedBase
-  source_root File.expand_path('templates', __dir__)
+  source_root File.expand_path("templates", __dir__)
 end
diff --git a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
index acdd5c6f28..d1e372d241 100644
--- a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
+++ b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
@@ -424,8 +424,8 @@ module Rails
 require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
-  t.libs << 'test'
-  t.pattern = 'test/**/*_test.rb'
+  t.libs << "test"
+  t.pattern = "test/**/*_test.rb"
   t.verbose = false
 end
         RUBY
diff --git a/railties/lib/rails/generators/rails/plugin/templates/%name%.gemspec.tt b/railties/lib/rails/generators/rails/plugin/templates/%name%.gemspec.tt
index 34733d291b..273d4351e8 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/%name%.gemspec.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/%name%.gemspec.tt
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.license     = "MIT"
   <% end -%>
 
-  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
+  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the "allowed_push_host"
   # to allow pushing to a single host or delete this section to allow pushing to any host.
   spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
 
@@ -22,5 +22,5 @@ Gem::Specification.new do |spec|
 
   spec.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
-  <%= '# ' if options.dev? || options.edge? || options.main? -%>spec.add_dependency "rails", "<%= Array(rails_version_specifier).join('", "') %>"
+  <%= "# " if options.dev? || options.edge? || options.main? -%>spec.add_dependency "rails", "<%= Array(rails_version_specifier).join('", "') %>"
 end
diff --git a/railties/lib/rails/generators/rails/plugin/templates/Gemfile.tt b/railties/lib/rails/generators/rails/plugin/templates/Gemfile.tt
index 7776116a76..d5cb96f088 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/Gemfile.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/Gemfile.tt
@@ -1,8 +1,8 @@
-source 'https://rubygems.org'
+source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 <% if options[:skip_gemspec] -%>
-<%= '# ' if options.dev? || options.edge? || options.main? -%>gem 'rails', '<%= Array(rails_version_specifier).join("', '") %>'
+<%= "# " if options.dev? || options.edge? || options.main? -%>gem "rails", "<%= Array(rails_version_specifier).join("', '") %>"
 <% else -%>
 # Specify your gem's dependencies in <%= name %>.gemspec.
 gemspec
@@ -10,7 +10,7 @@ gemspec
 <% unless options[:skip_active_record] -%>
 
 group :development do
-  gem '<%= gem_for_database[0] %>'
+  gem "<%= gem_for_database[0] %>"
 end
 <% end -%>
 
@@ -23,19 +23,19 @@ end
 
 # <%= gem.comment %>
 <% end -%>
-<%= gem.commented_out ? '# ' : '' %>gem '<%= gem.name %>'<%= %(, '#{gem.version}') if gem.version -%>
+<%= gem.commented_out ? "# " : "" %>gem "<%= gem.name %>"<%= %(, "#{gem.version}") if gem.version -%>
 <% if gem.options.any? -%>
 , <%= gem.options.map { |k,v|
-  "#{k}: #{v.inspect}" }.join(', ') %>
+  "#{k}: #{v.inspect}" }.join(", ") %>
 <% end -%>
 <% end -%>
 
 <% end -%>
-<% if RUBY_ENGINE == 'ruby' -%>
+<% if RUBY_ENGINE == "ruby" -%>
 # To use a debugger
-# gem 'byebug', group: [:development, :test]
+# gem "byebug", group: [:development, :test]
 <% end -%>
 <% if RUBY_PLATFORM.match(/bccwin|cygwin|emx|mingw|mswin|wince|java/) -%>
 
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 <% end -%>
diff --git a/railties/lib/rails/generators/rails/plugin/templates/README.md.tt b/railties/lib/rails/generators/rails/plugin/templates/README.md.tt
index 1632409bea..c14ce81b34 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/README.md.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/README.md.tt
@@ -8,7 +8,7 @@ How to use my plugin.
 Add this line to your application's Gemfile:
 
 ```ruby
-gem '<%= name %>'
+gem "<%= name %>"
 ```
 
 And then execute:
diff --git a/railties/lib/rails/generators/rails/plugin/templates/app/mailers/%namespaced_name%/application_mailer.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/app/mailers/%namespaced_name%/application_mailer.rb.tt
index 246e274348..b3ef3f4b65 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/app/mailers/%namespaced_name%/application_mailer.rb.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/app/mailers/%namespaced_name%/application_mailer.rb.tt
@@ -1,7 +1,7 @@
 <%= wrap_in_modules <<~rb
   class ApplicationMailer < ActionMailer::Base
-    default from: 'from@example.com'
-    layout 'mailer'
+    default from: "from@example.com"
+    layout "mailer"
   end
 rb
 %>
diff --git a/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/engine.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/engine.rb.tt
index 4ec1804940..fbb62d54be 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/engine.rb.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/engine.rb.tt
@@ -1,7 +1,7 @@
 <%= wrap_in_modules <<~rb
   class Engine < ::Rails::Engine
-  #{mountable? ? '  isolate_namespace ' + camelized_modules : ' '}
-  #{api? ? "  config.generators.api_only = true" : ' '}
+  #{mountable? ? "  isolate_namespace " + camelized_modules : " "}
+  #{api? ? "  config.generators.api_only = true" : " "}
   end
 rb
 %>
diff --git a/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/version.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/version.rb.tt
index b08f4ef9ae..6da2b0c85d 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/version.rb.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/lib/%namespaced_name%/version.rb.tt
@@ -1 +1 @@
-<%= wrap_in_modules "VERSION = '0.1.0'" %>
+<%= wrap_in_modules 'VERSION = "0.1.0"' %>
diff --git a/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb.tt
index 91e50810ef..116591a4ed 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb.tt
@@ -1,5 +1,5 @@
 # Set up gems listed in the Gemfile.
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../Gemfile', __dir__)
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../../Gemfile", __dir__)
 
 require "bundler/setup" if File.exist?(ENV["BUNDLE_GEMFILE"])
-$LOAD_PATH.unshift File.expand_path('../../../lib', __dir__)
+$LOAD_PATH.unshift File.expand_path("../../../lib", __dir__)
diff --git a/railties/lib/rails/generators/rails/plugin/templates/test/test_helper.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/test/test_helper.rb.tt
index d0e863fb6d..409641267a 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/test/test_helper.rb.tt
+++ b/railties/lib/rails/generators/rails/plugin/templates/test/test_helper.rb.tt
@@ -1,18 +1,18 @@
 # Configure Rails Environment
 ENV["RAILS_ENV"] = "test"
 
-require_relative "<%= File.join('..', options[:dummy_path], 'config/environment') -%>"
+require_relative "<%= File.join("..", options[:dummy_path], "config/environment") -%>"
 <% unless options[:skip_active_record] -%>
 ActiveRecord::Migrator.migrations_paths = [File.expand_path("../<%= options[:dummy_path] -%>/db/migrate", __dir__)]
 <% if options[:mountable] -%>
-ActiveRecord::Migrator.migrations_paths << File.expand_path('../db/migrate', __dir__)
+ActiveRecord::Migrator.migrations_paths << File.expand_path("../db/migrate", __dir__)
 <% end -%>
 <% end -%>
 require "rails/test_help"
 
 <% unless engine? -%>
 require "rails/test_unit/reporter"
-Rails::TestUnitReporter.executable = 'bin/test'
+Rails::TestUnitReporter.executable = "bin/test"
 <% end -%>
 
 <% unless options[:skip_active_record] -%>
diff --git a/railties/lib/rails/generators/test_unit/generator/templates/generator_test.rb.tt b/railties/lib/rails/generators/test_unit/generator/templates/generator_test.rb.tt
index 5b07e57dbd..2dc0f76a43 100644
--- a/railties/lib/rails/generators/test_unit/generator/templates/generator_test.rb.tt
+++ b/railties/lib/rails/generators/test_unit/generator/templates/generator_test.rb.tt
@@ -4,7 +4,7 @@ require "<%= generator_path %>"
 <% module_namespacing do -%>
 class <%= class_name %>GeneratorTest < Rails::Generators::TestCase
   tests <%= class_name %>Generator
-  destination Rails.root.join('tmp/generators')
+  destination Rails.root.join("tmp/generators")
   setup :prepare_destination
 
   # test "generator runs without errors" do
diff --git a/railties/lib/rails/generators/test_unit/model/templates/fixtures.yml.tt b/railties/lib/rails/generators/test_unit/model/templates/fixtures.yml.tt
index 5f7e76bb76..3d79f247e9 100644
--- a/railties/lib/rails/generators/test_unit/model/templates/fixtures.yml.tt
+++ b/railties/lib/rails/generators/test_unit/model/templates/fixtures.yml.tt
@@ -4,7 +4,7 @@
 <%= name %>:
 <% attributes.each do |attribute| -%>
   <%- if attribute.password_digest? -%>
-  password_digest: <%%= BCrypt::Password.create('secret') %>
+  password_digest: <%%= BCrypt::Password.create("secret") %>
   <%- elsif attribute.reference? -%>
   <%= yaml_key_value(attribute.column_name.delete_suffix("_id"), attribute.default || name) %>
   <%- elsif !attribute.virtual? -%>
@@ -18,7 +18,7 @@
 <% else -%>
 
 # This model initially had no columns defined. If you add columns to the
-# model remove the '{}' from the fixture names and add the columns immediately
+# model remove the "{}" from the fixture names and add the columns immediately
 # below each fixture, per the syntax in the comments below
 #
 one: {}
diff --git a/railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb b/railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb
index 3a82081d6a..f1601f25d8 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb
@@ -47,7 +47,7 @@ module TestUnit # :nodoc:
 
           attributes_names.filter_map do |name|
             if %w(password password_confirmation).include?(name) && attributes.any?(&:password_digest?)
-              ["#{name}", "'secret'"]
+              ["#{name}", '"secret"']
             elsif !virtual?(name)
               ["#{name}", "@#{singular_table_name}.#{name}"]
             end
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb.tt b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb.tt
index f544a1b945..4b00b3ff39 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb.tt
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb.tt
@@ -16,7 +16,7 @@ class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTe
   end
 
   test "should create <%= singular_table_name %>" do
-    assert_difference('<%= class_name %>.count') do
+    assert_difference("<%= class_name %>.count") do
       post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_string} }" %> }, as: :json
     end
 
@@ -34,7 +34,7 @@ class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTe
   end
 
   test "should destroy <%= singular_table_name %>" do
-    assert_difference('<%= class_name %>.count', -1) do
+    assert_difference("<%= class_name %>.count", -1) do
       delete <%= show_helper %>, as: :json
     end
 
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb.tt b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb.tt
index 6704c8c025..c3b0d615b2 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb.tt
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb.tt
@@ -21,7 +21,7 @@ class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTe
   end
 
   test "should create <%= singular_table_name %>" do
-    assert_difference('<%= class_name %>.count') do
+    assert_difference("<%= class_name %>.count") do
       post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_string} }" %> }
     end
 
@@ -44,7 +44,7 @@ class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTe
   end
 
   test "should destroy <%= singular_table_name %>" do
-    assert_difference('<%= class_name %>.count', -1) do
+    assert_difference("<%= class_name %>.count", -1) do
       delete <%= show_helper %>
     end
 
diff --git a/railties/lib/rails/generators/testing/behaviour.rb b/railties/lib/rails/generators/testing/behaviour.rb
index e5264c1946..e059308696 100644
--- a/railties/lib/rails/generators/testing/behaviour.rb
+++ b/railties/lib/rails/generators/testing/behaviour.rb
@@ -82,7 +82,7 @@ module Rails
         # Create a Rails::Generators::GeneratedAttribute by supplying the
         # attribute type and, optionally, the attribute name:
         #
-        #   create_generated_attribute(:string, 'name')
+        #   create_generated_attribute(:string, "name")
         def create_generated_attribute(attribute_type, name = "test", index = nil)
           Rails::Generators::GeneratedAttribute.parse([name, attribute_type, index].compact.join(":"))
         end
diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb
index b83c8e8a82..a689f0d9d9 100644
--- a/railties/test/generators/actions_test.rb
+++ b/railties/test/generators/actions_test.rb
@@ -43,7 +43,7 @@ class ActionsTest < Rails::Generators::TestCase
   def test_add_source_adds_source_to_gemfile
     run_generator
     action :add_source, "http://gems.github.com"
-    assert_file "Gemfile", /source 'http:\/\/gems\.github\.com'\n/
+    assert_file "Gemfile", /source "http:\/\/gems\.github\.com"\n/
   end
 
   def test_add_source_with_block_adds_source_to_gemfile_with_gem
@@ -51,7 +51,7 @@ class ActionsTest < Rails::Generators::TestCase
     action :add_source, "http://gems.github.com" do
       gem "rspec-rails"
     end
-    assert_file "Gemfile", /\n\nsource 'http:\/\/gems\.github\.com' do\n  gem 'rspec-rails'\nend\n\z/
+    assert_file "Gemfile", /\n\nsource "http:\/\/gems\.github\.com" do\n  gem "rspec-rails"\nend\n\z/
   end
 
   def test_add_source_with_block_adds_source_to_gemfile_after_gem
@@ -60,7 +60,7 @@ class ActionsTest < Rails::Generators::TestCase
     action :add_source, "http://gems.github.com" do
       gem "rspec-rails"
     end
-    assert_file "Gemfile", /\ngem 'will-paginate'\n\nsource 'http:\/\/gems\.github\.com' do\n  gem 'rspec-rails'\nend\n\z/
+    assert_file "Gemfile", /\ngem "will-paginate"\n\nsource "http:\/\/gems\.github\.com" do\n  gem "rspec-rails"\nend\n\z/
   end
 
   def test_add_source_should_create_newline_between_blocks
@@ -72,13 +72,13 @@ class ActionsTest < Rails::Generators::TestCase
     action :add_source, "http://gems2.github.com" do
       gem "fakeweb"
     end
-    assert_file "Gemfile", /\n\nsource 'http:\/\/gems\.github\.com' do\n  gem 'rspec-rails'\nend\n\nsource 'http:\/\/gems2\.github\.com' do\n  gem 'fakeweb'\nend\n\z/
+    assert_file "Gemfile", /\n\nsource "http:\/\/gems\.github\.com" do\n  gem "rspec-rails"\nend\n\nsource "http:\/\/gems2\.github\.com" do\n  gem "fakeweb"\nend\n\z/
   end
 
   def test_gem_should_put_gem_dependency_in_gemfile
     run_generator
     action :gem, "will-paginate"
-    assert_file "Gemfile", /gem 'will-paginate'\n\z/
+    assert_file "Gemfile", /gem "will-paginate"\n\z/
   end
 
   def test_gem_with_version_should_include_version_in_gemfile
@@ -89,10 +89,10 @@ class ActionsTest < Rails::Generators::TestCase
     action :gem, "faker", version: [">= 0.1.0", "< 0.3.0"]
 
     assert_file "Gemfile" do |content|
-      assert_match(/gem 'rspec', '>= 2\.0\.0\.a5'/, content)
-      assert_match(/gem 'RedCloth', '>= 4\.1\.0', '< 4\.2\.0'/, content)
-      assert_match(/gem 'nokogiri', '>= 1\.4\.2'/, content)
-      assert_match(/gem 'faker', '>= 0\.1\.0', '< 0\.3\.0'/, content)
+      assert_match(/gem "rspec", ">= 2\.0\.0\.a5"/, content)
+      assert_match(/gem "RedCloth", ">= 4\.1\.0", "< 4\.2\.0"/, content)
+      assert_match(/gem "nokogiri", ">= 1\.4\.2"/, content)
+      assert_match(/gem "faker", ">= 0\.1\.0", "< 0\.3\.0"/, content)
     end
   end
 
@@ -104,8 +104,8 @@ class ActionsTest < Rails::Generators::TestCase
     action :gem, "rspec"
     action :gem, "rspec-rails"
 
-    assert_file "Gemfile", /^gem 'rspec'$/
-    assert_file "Gemfile", /^gem 'rspec-rails'$/
+    assert_file "Gemfile", /^gem "rspec"$/
+    assert_file "Gemfile", /^gem "rspec-rails"$/
   end
 
   def test_gem_should_include_options
@@ -113,7 +113,7 @@ class ActionsTest < Rails::Generators::TestCase
 
     action :gem, "rspec", github: "dchelimsky/rspec", tag: "1.2.9.rc1"
 
-    assert_file "Gemfile", /gem 'rspec', github: 'dchelimsky\/rspec', tag: '1\.2\.9\.rc1'/
+    assert_file "Gemfile", /gem "rspec", github: "dchelimsky\/rspec", tag: "1\.2\.9\.rc1"/
   end
 
   def test_gem_with_non_string_options
@@ -122,16 +122,16 @@ class ActionsTest < Rails::Generators::TestCase
     action :gem, "rspec", require: false
     action :gem, "rspec-rails", group: [:development, :test]
 
-    assert_file "Gemfile", /^gem 'rspec', require: false$/
-    assert_file "Gemfile", /^gem 'rspec-rails', group: \[:development, :test\]$/
+    assert_file "Gemfile", /^gem "rspec", require: false$/
+    assert_file "Gemfile", /^gem "rspec-rails", group: \[:development, :test\]$/
   end
 
   def test_gem_falls_back_to_inspect_if_string_contains_single_quote
     run_generator
 
-    action :gem, "rspec", ">=2.0'0"
+    action :gem, "rspec", ">=2.0.0"
 
-    assert_file "Gemfile", /^gem 'rspec', ">=2\.0'0"$/
+    assert_file "Gemfile", /^gem "rspec", ">=2\.0\.0"$/
   end
 
   def test_gem_works_even_if_frozen_string_is_passed_as_argument
@@ -139,7 +139,7 @@ class ActionsTest < Rails::Generators::TestCase
 
     action :gem, -"frozen_gem", -"1.0.0"
 
-    assert_file "Gemfile", /^gem 'frozen_gem', '1.0.0'$/
+    assert_file "Gemfile", /^gem "frozen_gem", "1\.0\.0"$/
   end
 
   def test_gem_group_should_wrap_gems_in_a_group
@@ -153,7 +153,7 @@ class ActionsTest < Rails::Generators::TestCase
       gem "fakeweb"
     end
 
-    assert_file "Gemfile", /\n\ngroup :development, :test do\n  gem 'rspec-rails'\nend\n\ngroup :test do\n  gem 'fakeweb'\nend\n\z/
+    assert_file "Gemfile", /\n\ngroup :development, :test do\n  gem "rspec-rails"\nend\n\ngroup :test do\n  gem "fakeweb"\nend\n\z/
   end
 
   def test_github_should_create_an_indented_block
@@ -165,7 +165,7 @@ class ActionsTest < Rails::Generators::TestCase
       gem "baz"
     end
 
-    assert_file "Gemfile", /\n\ngithub 'user\/repo' do\n  gem 'foo'\n  gem 'bar'\n  gem 'baz'\nend\n\z/
+    assert_file "Gemfile", /\n\ngithub "user\/repo" do\n  gem "foo"\n  gem "bar"\n  gem "baz"\nend\n\z/
   end
 
   def test_github_should_create_an_indented_block_with_options
@@ -177,7 +177,7 @@ class ActionsTest < Rails::Generators::TestCase
       gem "baz"
     end
 
-    assert_file "Gemfile", /\n\ngithub 'user\/repo', a: 'correct', other: true do\n  gem 'foo'\n  gem 'bar'\n  gem 'baz'\nend\n\z/
+    assert_file "Gemfile", /\n\ngithub "user\/repo", a: "correct", other: true do\n  gem "foo"\n  gem "bar"\n  gem "baz"\nend\n\z/
   end
 
   def test_github_should_create_an_indented_block_within_a_group
@@ -196,7 +196,7 @@ class ActionsTest < Rails::Generators::TestCase
       end
     end
 
-    assert_file "Gemfile", /\n\ngroup :magic do\n  github 'user\/repo', a: 'correct', other: true do\n    gem 'foo'\n    gem 'bar'\n    gem 'baz'\n  end\n  github 'user\/repo2', a: 'correct', other: true do\n    gem 'foo'\n    gem 'bar'\n    gem 'baz'\n  end\nend\n\z/
+    assert_file "Gemfile", /\n\ngroup :magic do\n  github "user\/repo", a: "correct", other: true do\n    gem "foo"\n    gem "bar"\n    gem "baz"\n  end\n  github "user\/repo2", a: "correct", other: true do\n    gem "foo"\n    gem "bar"\n    gem "baz"\n  end\nend\n\z/
   end
 
   def test_github_should_create_newline_between_blocks
@@ -214,48 +214,48 @@ class ActionsTest < Rails::Generators::TestCase
       gem "baz"
     end
 
-    assert_file "Gemfile", /\n\ngithub 'user\/repo', a: 'correct', other: true do\n  gem 'foo'\n  gem 'bar'\n  gem 'baz'\nend\n\ngithub 'user\/repo2', a: 'correct', other: true do\n  gem 'foo'\n  gem 'bar'\n  gem 'baz'\nend\n\z/
+    assert_file "Gemfile", /\n\ngithub "user\/repo", a: "correct", other: true do\n  gem "foo"\n  gem "bar"\n  gem "baz"\nend\n\ngithub "user\/repo2", a: "correct", other: true do\n  gem "foo"\n  gem "bar"\n  gem "baz"\nend\n\z/
   end
 
   def test_gem_with_gemfile_without_newline_at_the_end
     run_generator
-    File.open("Gemfile", "a") { |f| f.write("gem 'rspec-rails'") }
+    File.open("Gemfile", "a") { |f| f.write('gem "rspec-rails"') }
 
     action :gem, "will-paginate"
-    assert_file "Gemfile", /gem 'rspec-rails'\ngem 'will-paginate'\n\z/
+    assert_file "Gemfile", /gem "rspec-rails"\ngem "will-paginate"\n\z/
   end
 
   def test_gem_group_with_gemfile_without_newline_at_the_end
     run_generator
-    File.open("Gemfile", "a") { |f| f.write("gem 'rspec-rails'") }
+    File.open("Gemfile", "a") { |f| f.write('gem "rspec-rails"') }
 
     action :gem_group, :test do
       gem "fakeweb"
     end
 
-    assert_file "Gemfile", /gem 'rspec-rails'\n\ngroup :test do\n  gem 'fakeweb'\nend\n\z/
+    assert_file "Gemfile", /gem "rspec-rails"\n\ngroup :test do\n  gem "fakeweb"\nend\n\z/
   end
 
   def test_add_source_with_gemfile_without_newline_at_the_end
     run_generator
-    File.open("Gemfile", "a") { |f| f.write("gem 'rspec-rails'") }
+    File.open("Gemfile", "a") { |f| f.write('gem "rspec-rails"') }
 
     action :add_source, "http://gems.github.com" do
       gem "fakeweb"
     end
 
-    assert_file "Gemfile", /gem 'rspec-rails'\n\nsource 'http:\/\/gems\.github\.com' do\n  gem 'fakeweb'\nend\n\z/
+    assert_file "Gemfile", /gem "rspec-rails"\n\nsource "http:\/\/gems\.github\.com" do\n  gem "fakeweb"\nend\n\z/
   end
 
   def test_github_with_gemfile_without_newline_at_the_end
     run_generator
-    File.open("Gemfile", "a") { |f| f.write("gem 'rspec-rails'") }
+    File.open("Gemfile", "a") { |f| f.write('gem "rspec-rails"') }
 
     action :github, "user/repo" do
       gem "fakeweb"
     end
 
-    assert_file "Gemfile", /gem 'rspec-rails'\n\ngithub 'user\/repo' do\n  gem 'fakeweb'\nend\n\z/
+    assert_file "Gemfile", /gem "rspec-rails"\n\ngithub "user\/repo" do\n  gem "fakeweb"\nend\n\z/
   end
 
   def test_environment_should_include_data_in_environment_initializer_block
@@ -533,7 +533,7 @@ class ActionsTest < Rails::Generators::TestCase
 
   test "route should add route" do
     run_generator
-    route_commands = ["get 'foo'", "get 'bar'", "get 'baz'"]
+    route_commands = ['get "foo"', 'get "bar"', 'get "baz"']
     route_commands.each do |route_command|
       action :route, route_command
     end
@@ -542,14 +542,14 @@ class ActionsTest < Rails::Generators::TestCase
 
   test "route should indent routing code" do
     run_generator
-    route_commands = ["get 'foo'", "get 'bar'", "get 'baz'"]
+    route_commands = ['get "foo"', 'get "bar"', 'get "baz"']
     action :route, route_commands.join("\n")
     assert_routes route_commands
   end
 
   test "route should be idempotent" do
     run_generator
-    route_command = "root 'welcome#index'"
+    route_command = 'root "welcome#index"'
 
     # runs first time
     action :route, route_command
diff --git a/railties/test/generators/api_app_generator_test.rb b/railties/test/generators/api_app_generator_test.rb
index a2f3d8fe4d..0c17ff9848 100644
--- a/railties/test/generators/api_app_generator_test.rb
+++ b/railties/test/generators/api_app_generator_test.rb
@@ -40,12 +40,12 @@ class ApiAppGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "Gemfile" do |content|
-      assert_no_match(/gem 'sass-rails'/, content)
-      assert_no_match(/gem 'web-console'/, content)
-      assert_no_match(/gem 'capybara'/, content)
-      assert_no_match(/gem 'selenium-webdriver'/, content)
-      assert_match(/# gem 'jbuilder'/, content)
-      assert_match(/# gem 'rack-cors'/, content)
+      assert_no_match(/gem "sass-rails"/, content)
+      assert_no_match(/gem "web-console"/, content)
+      assert_no_match(/gem "capybara"/, content)
+      assert_no_match(/gem "selenium-webdriver"/, content)
+      assert_match(/# gem "jbuilder"/, content)
+      assert_match(/# gem "rack-cors"/, content)
     end
 
     assert_file "config/application.rb", /config\.api_only = true/
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index c68e9ef4cf..a994dd8ee3 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -387,7 +387,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
 
   def test_gem_for_active_storage
     run_generator
-    assert_file "Gemfile", /^# gem 'image_processing'/
+    assert_file "Gemfile", /^# gem "image_processing"/
   end
 
   def test_gem_for_active_storage_when_skip_active_storage_is_given
@@ -537,7 +537,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     if defined?(JRUBY_VERSION)
       assert_gem "activerecord-jdbcsqlite3-adapter"
     else
-      assert_gem "sqlite3", "'~> 1.4'"
+      assert_gem "sqlite3", '"~> 1.4"'
     end
   end
 
@@ -547,7 +547,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     if defined?(JRUBY_VERSION)
       assert_gem "activerecord-jdbcmysql-adapter"
     else
-      assert_gem "mysql2", "'~> 0.5'"
+      assert_gem "mysql2", '"~> 0.5"'
     end
   end
 
@@ -562,7 +562,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     if defined?(JRUBY_VERSION)
       assert_gem "activerecord-jdbcpostgresql-adapter"
     else
-      assert_gem "pg", "'~> 1.1'"
+      assert_gem "pg", '"~> 1.1"'
     end
   end
 
@@ -601,7 +601,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
 
   def test_generator_defaults_to_puma_version
     run_generator [destination_root]
-    assert_gem "puma", "'~> 5.0'"
+    assert_gem "puma", '"~> 5.0"'
   end
 
   def test_generator_if_skip_puma_is_given
@@ -618,7 +618,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
 
   def test_action_cable_redis_gems
     run_generator
-    assert_file "Gemfile", /^# gem 'redis'/
+    assert_file "Gemfile", /^# gem "redis"/
   end
 
   def test_generator_if_skip_test_is_given
@@ -798,8 +798,8 @@ class AppGeneratorTest < Rails::Generators::TestCase
     run_generator [destination_root, "--dev", "--skip-bundle"]
 
     assert_file "Gemfile" do |content|
-      assert_match(/gem 'web-console',\s+github: 'rails\/web-console'/, content)
-      assert_no_match(/\Agem 'web-console', '>= 4\.1\.0'\z/, content)
+      assert_match(/gem "web-console",\s+github: "rails\/web-console"/, content)
+      assert_no_match(/\Agem "web-console", ">= 4\.1\.0"\z/, content)
     end
   end
 
@@ -807,8 +807,8 @@ class AppGeneratorTest < Rails::Generators::TestCase
     run_generator [destination_root, "--edge"]
 
     assert_file "Gemfile" do |content|
-      assert_match(/gem 'web-console',\s+github: 'rails\/web-console'/, content)
-      assert_no_match(/\Agem 'web-console', '>= 4\.1\.0'\z/, content)
+      assert_match(/gem "web-console",\s+github: "rails\/web-console"/, content)
+      assert_no_match(/\Agem "web-console", ">= 4\.1\.0"\z/, content)
     end
   end
 
@@ -816,8 +816,8 @@ class AppGeneratorTest < Rails::Generators::TestCase
     run_generator [destination_root, "--main"]
 
     assert_file "Gemfile" do |content|
-      assert_match(/gem 'web-console',\s+github: 'rails\/web-console'/, content)
-      assert_no_match(/\Agem 'web-console', '>= 4\.1\.0'\z/, content)
+      assert_match(/gem "web-console",\s+github: "rails\/web-console"/, content)
+      assert_no_match(/\Agem "web-console", ">= 4\.1\.0"\z/, content)
     end
   end
 
@@ -1072,7 +1072,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     run_generator
 
     assert_file "Gemfile" do |content|
-      assert_match(/ruby '#{RUBY_VERSION}'/, content)
+      assert_match(/ruby "#{RUBY_VERSION}"/, content)
     end
     assert_file ".ruby-version" do |content|
       if ENV["RBENV_VERSION"]
diff --git a/railties/test/generators/benchmark_generator_test.rb b/railties/test/generators/benchmark_generator_test.rb
index 68e5546820..b9a801936f 100644
--- a/railties/test/generators/benchmark_generator_test.rb
+++ b/railties/test/generators/benchmark_generator_test.rb
@@ -16,7 +16,7 @@ module Rails
         run_generator ["my_benchmark"]
 
         assert_file("Gemfile") do |content|
-          assert_match "gem 'benchmark-ips'", content
+          assert_match "gem \"benchmark-ips\"", content
         end
 
         assert_file("script/benchmarks/my_benchmark.rb") do |content|
@@ -77,7 +77,7 @@ module Rails
         run_generator ["my_benchmark"]
 
         assert_file("Gemfile") do |content|
-          occurrences = content.scan("gem 'benchmark-ips'").count
+          occurrences = content.scan("gem \"benchmark-ips\"").count
           assert_equal 1, occurrences, "Should only have benchmark-ips present once"
         end
       end
diff --git a/railties/test/generators/db_system_change_generator_test.rb b/railties/test/generators/db_system_change_generator_test.rb
index 943a6e874a..584e6e864c 100644
--- a/railties/test/generators/db_system_change_generator_test.rb
+++ b/railties/test/generators/db_system_change_generator_test.rb
@@ -40,7 +40,7 @@ module Rails
 
             assert_file("Gemfile") do |content|
               assert_match "# Use pg as the database for Active Record", content
-              assert_match "gem 'pg', '~> 1.1'", content
+              assert_match 'gem "pg", "~> 1.1"', content
             end
           end
 
@@ -54,7 +54,7 @@ module Rails
 
             assert_file("Gemfile") do |content|
               assert_match "# Use mysql2 as the database for Active Record", content
-              assert_match "gem 'mysql2', '~> 0.5'", content
+              assert_match 'gem "mysql2", "~> 0.5"', content
             end
           end
 
@@ -68,7 +68,7 @@ module Rails
 
             assert_file("Gemfile") do |content|
               assert_match "# Use sqlite3 as the database for Active Record", content
-              assert_match "gem 'sqlite3', '~> 1.4'", content
+              assert_match 'gem "sqlite3", "~> 1.4"', content
             end
           end
 
@@ -83,7 +83,7 @@ module Rails
 
             assert_file("Gemfile") do |content|
               assert_match "# Use mysql2 as the database for Active Record", content
-              assert_match "gem 'mysql2', '~> 0.5'", content
+              assert_match 'gem "mysql2", "~> 0.5"', content
             end
           end
         end
diff --git a/railties/test/generators/model_generator_test.rb b/railties/test/generators/model_generator_test.rb
index 827d539209..e9d02ce3d8 100644
--- a/railties/test/generators/model_generator_test.rb
+++ b/railties/test/generators/model_generator_test.rb
@@ -134,7 +134,7 @@ class ModelGeneratorTest < Rails::Generators::TestCase
     run_generator ["admin/account"]
     assert_file "app/models/admin.rb", /module Admin/
     assert_file "app/models/admin.rb", /def self\.table_name_prefix/
-    assert_file "app/models/admin.rb", /'admin_'/
+    assert_file "app/models/admin.rb", /"admin_"/
     assert_file "app/models/admin/account.rb", /class Admin::Account < ApplicationRecord/
   end
 
diff --git a/railties/test/generators/namespaced_generators_test.rb b/railties/test/generators/namespaced_generators_test.rb
index 6b9a53f226..3eaa68fd53 100644
--- a/railties/test/generators/namespaced_generators_test.rb
+++ b/railties/test/generators/namespaced_generators_test.rb
@@ -98,7 +98,7 @@ class NamespacedModelGeneratorTest < NamespacedGeneratorTestCase
     run_generator ["admin/account"]
     assert_file "app/models/test_app/admin.rb", /module TestApp/, /module Admin/
     assert_file "app/models/test_app/admin.rb", /def self\.table_name_prefix/
-    assert_file "app/models/test_app/admin.rb", /'test_app_admin_'/
+    assert_file "app/models/test_app/admin.rb", /"test_app_admin_"/
     assert_file "app/models/test_app/admin/account.rb", /module TestApp/, /class Admin::Account < ApplicationRecord/
   end
 
diff --git a/railties/test/generators/plugin_generator_test.rb b/railties/test/generators/plugin_generator_test.rb
index a7c6c8b68a..a5010449d5 100644
--- a/railties/test/generators/plugin_generator_test.rb
+++ b/railties/test/generators/plugin_generator_test.rb
@@ -71,7 +71,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "test/test_helper.rb" do |content|
       assert_match(/require_relative.+test\/dummy\/config\/environment/, content)
       assert_match(/ActiveRecord::Migrator\.migrations_paths.+test\/dummy\/db\/migrate/, content)
-      assert_match(/Rails::TestUnitReporter\.executable = 'bin\/test'/, content)
+      assert_match(/Rails::TestUnitReporter\.executable = "bin\/test"/, content)
     end
     assert_file "lib/bukkits/railtie.rb", /module Bukkits\n  class Railtie < ::Rails::Railtie\n  end\nend/
     assert_file "lib/bukkits.rb" do |content|
@@ -152,7 +152,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
         assert_no_match(/byebug/, content)
       end
     else
-      assert_file "Gemfile", /# gem 'byebug'/
+      assert_file "Gemfile", /# gem "byebug"/
     end
   end
 
@@ -396,7 +396,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "app/controllers/bukkits/application_controller.rb", /module Bukkits\n  class ApplicationController < ActionController::Base/
     assert_file "app/models/bukkits/application_record.rb", /module Bukkits\n  class ApplicationRecord < ActiveRecord::Base/
     assert_file "app/jobs/bukkits/application_job.rb", /module Bukkits\n  class ApplicationJob < ActiveJob::Base/
-    assert_file "app/mailers/bukkits/application_mailer.rb", /module Bukkits\n  class ApplicationMailer < ActionMailer::Base\n    default from: 'from@example\.com'\n    layout 'mailer'\n/
+    assert_file "app/mailers/bukkits/application_mailer.rb", /module Bukkits\n  class ApplicationMailer < ActionMailer::Base\n    default from: "from@example\.com"\n    layout "mailer"\n/
     assert_file "app/helpers/bukkits/application_helper.rb", /module Bukkits\n  module ApplicationHelper/
     assert_file "app/views/layouts/bukkits/application.html.erb" do |contents|
       assert_match "<title>Bukkits</title>", contents
@@ -410,7 +410,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
       assert_match(/ActiveRecord::Migrator\.migrations_paths.+\.\.\/test\/dummy\/db\/migrate/, content)
       assert_match(/ActiveRecord::Migrator\.migrations_paths.+<<.+\.\.\/db\/migrate/, content)
       assert_match(/ActionDispatch::IntegrationTest\.fixture_path = ActiveSupport::TestCase\.fixture_pat/, content)
-      assert_no_match(/Rails::TestUnitReporter\.executable = 'bin\/test'/, content)
+      assert_no_match(/Rails::TestUnitReporter\.executable = "bin\/test"/, content)
     end
     assert_no_file "bin/test"
   end
@@ -421,14 +421,14 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "hyphenated-name/app/assets/stylesheets/hyphenated/name"
     assert_file "hyphenated-name/app/assets/images/hyphenated/name"
     assert_file "hyphenated-name/config/routes.rb",                                          /Hyphenated::Name::Engine\.routes\.draw do/
-    assert_file "hyphenated-name/lib/hyphenated/name/version.rb",                            /module Hyphenated\n  module Name\n    VERSION = '0\.1\.0'\n  end\nend/
+    assert_file "hyphenated-name/lib/hyphenated/name/version.rb",                            /module Hyphenated\n  module Name\n    VERSION = "0\.1\.0"\n  end\nend/
     assert_file "hyphenated-name/lib/hyphenated/name/engine.rb",                             /module Hyphenated\n  module Name\n    class Engine < ::Rails::Engine\n      isolate_namespace Hyphenated::Name\n    end\n  end\nend/
     assert_file "hyphenated-name/lib/hyphenated/name.rb",                                    /require "hyphenated\/name\/engine"/
     assert_file "hyphenated-name/test/dummy/config/routes.rb",                               /mount Hyphenated::Name::Engine => "\/hyphenated-name"/
     assert_file "hyphenated-name/app/controllers/hyphenated/name/application_controller.rb", /module Hyphenated\n  module Name\n    class ApplicationController < ActionController::Base\n    end\n  end\nend\n/
     assert_file "hyphenated-name/app/models/hyphenated/name/application_record.rb",          /module Hyphenated\n  module Name\n    class ApplicationRecord < ActiveRecord::Base\n      primary_abstract_class\n    end\n  end\nend/
     assert_file "hyphenated-name/app/jobs/hyphenated/name/application_job.rb",               /module Hyphenated\n  module Name\n    class ApplicationJob < ActiveJob::Base/
-    assert_file "hyphenated-name/app/mailers/hyphenated/name/application_mailer.rb",         /module Hyphenated\n  module Name\n    class ApplicationMailer < ActionMailer::Base\n      default from: 'from@example\.com'\n      layout 'mailer'\n    end\n  end\nend/
+    assert_file "hyphenated-name/app/mailers/hyphenated/name/application_mailer.rb",         /module Hyphenated\n  module Name\n    class ApplicationMailer < ActionMailer::Base\n      default from: "from@example\.com"\n      layout "mailer"\n    end\n  end\nend/
     assert_file "hyphenated-name/app/helpers/hyphenated/name/application_helper.rb",         /module Hyphenated\n  module Name\n    module ApplicationHelper\n    end\n  end\nend/
     assert_file "hyphenated-name/app/views/layouts/hyphenated/name/application.html.erb" do |contents|
       assert_match "<title>Hyphenated name</title>", contents
@@ -443,18 +443,18 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "my_hyphenated-name/app/assets/stylesheets/my_hyphenated/name"
     assert_file "my_hyphenated-name/app/assets/images/my_hyphenated/name"
     assert_file "my_hyphenated-name/config/routes.rb",                                             /MyHyphenated::Name::Engine\.routes\.draw do/
-    assert_file "my_hyphenated-name/lib/my_hyphenated/name/version.rb",                            /module MyHyphenated\n  module Name\n    VERSION = '0\.1\.0'\n  end\nend/
+    assert_file "my_hyphenated-name/lib/my_hyphenated/name/version.rb",                            /module MyHyphenated\n  module Name\n    VERSION = "0\.1\.0"\n  end\nend/
     assert_file "my_hyphenated-name/lib/my_hyphenated/name/engine.rb",                             /module MyHyphenated\n  module Name\n    class Engine < ::Rails::Engine\n      isolate_namespace MyHyphenated::Name\n    end\n  end\nend/
     assert_file "my_hyphenated-name/lib/my_hyphenated/name.rb",                                    /require "my_hyphenated\/name\/engine"/
     assert_file "my_hyphenated-name/test/dummy/config/routes.rb",                                  /mount MyHyphenated::Name::Engine => "\/my_hyphenated-name"/
     assert_file "my_hyphenated-name/app/controllers/my_hyphenated/name/application_controller.rb", /module MyHyphenated\n  module Name\n    class ApplicationController < ActionController::Base\n    end\n  end\nend\n/
     assert_file "my_hyphenated-name/app/models/my_hyphenated/name/application_record.rb",          /module MyHyphenated\n  module Name\n    class ApplicationRecord < ActiveRecord::Base\n      primary_abstract_class\n    end\n  end\nend/
     assert_file "my_hyphenated-name/app/jobs/my_hyphenated/name/application_job.rb",               /module MyHyphenated\n  module Name\n    class ApplicationJob < ActiveJob::Base/
-    assert_file "my_hyphenated-name/app/mailers/my_hyphenated/name/application_mailer.rb",         /module MyHyphenated\n  module Name\n    class ApplicationMailer < ActionMailer::Base\n      default from: 'from@example\.com'\n      layout 'mailer'\n    end\n  end\nend/
+    assert_file "my_hyphenated-name/app/mailers/my_hyphenated/name/application_mailer.rb",         /module MyHyphenated\n  module Name\n    class ApplicationMailer < ActionMailer::Base\n      default from: "from@example\.com"\n      layout "mailer"\n    end\n  end\nend/
     assert_file "my_hyphenated-name/app/helpers/my_hyphenated/name/application_helper.rb",         /module MyHyphenated\n  module Name\n    module ApplicationHelper\n    end\n  end\nend/
     assert_file "my_hyphenated-name/app/views/layouts/my_hyphenated/name/application.html.erb" do |contents|
       assert_match "<title>My hyphenated name</title>", contents
-      assert_match(/stylesheet_link_tag\s+['"]my_hyphenated\/name\/application['"]/, contents)
+      assert_match(/stylesheet_link_tag\s+[""]my_hyphenated\/name\/application['"]/, contents)
       assert_no_match(/javascript_include_tag\s+['"]my_hyphenated\/name\/application['"]/, contents)
     end
   end
@@ -465,14 +465,14 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "deep-hyphenated-name/app/assets/stylesheets/deep/hyphenated/name"
     assert_file "deep-hyphenated-name/app/assets/images/deep/hyphenated/name"
     assert_file "deep-hyphenated-name/config/routes.rb",                                               /Deep::Hyphenated::Name::Engine\.routes\.draw do/
-    assert_file "deep-hyphenated-name/lib/deep/hyphenated/name/version.rb",                            /module Deep\n  module Hyphenated\n    module Name\n      VERSION = '0\.1\.0'\n    end\n  end\nend/
+    assert_file "deep-hyphenated-name/lib/deep/hyphenated/name/version.rb",                            /module Deep\n  module Hyphenated\n    module Name\n      VERSION = "0\.1\.0"\n    end\n  end\nend/
     assert_file "deep-hyphenated-name/lib/deep/hyphenated/name/engine.rb",                             /module Deep\n  module Hyphenated\n    module Name\n      class Engine < ::Rails::Engine\n        isolate_namespace Deep::Hyphenated::Name\n      end\n    end\n  end\nend/
     assert_file "deep-hyphenated-name/lib/deep/hyphenated/name.rb",                                    /require "deep\/hyphenated\/name\/engine"/
     assert_file "deep-hyphenated-name/test/dummy/config/routes.rb",                                    /mount Deep::Hyphenated::Name::Engine => "\/deep-hyphenated-name"/
     assert_file "deep-hyphenated-name/app/controllers/deep/hyphenated/name/application_controller.rb", /module Deep\n  module Hyphenated\n    module Name\n      class ApplicationController < ActionController::Base\n      end\n    end\n  end\nend\n/
     assert_file "deep-hyphenated-name/app/models/deep/hyphenated/name/application_record.rb",          /module Deep\n  module Hyphenated\n    module Name\n      class ApplicationRecord < ActiveRecord::Base\n        primary_abstract_class\n      end\n    end\n  end\nend/
     assert_file "deep-hyphenated-name/app/jobs/deep/hyphenated/name/application_job.rb",               /module Deep\n  module Hyphenated\n    module Name\n      class ApplicationJob < ActiveJob::Base/
-    assert_file "deep-hyphenated-name/app/mailers/deep/hyphenated/name/application_mailer.rb",         /module Deep\n  module Hyphenated\n    module Name\n      class ApplicationMailer < ActionMailer::Base\n        default from: 'from@example\.com'\n        layout 'mailer'\n      end\n    end\n  end\nend/
+    assert_file "deep-hyphenated-name/app/mailers/deep/hyphenated/name/application_mailer.rb",         /module Deep\n  module Hyphenated\n    module Name\n      class ApplicationMailer < ActionMailer::Base\n        default from: "from@example\.com"\n        layout "mailer"\n      end\n    end\n  end\nend/
     assert_file "deep-hyphenated-name/app/helpers/deep/hyphenated/name/application_helper.rb",         /module Deep\n  module Hyphenated\n    module Name\n      module ApplicationHelper\n      end\n    end\n  end\nend/
     assert_file "deep-hyphenated-name/app/views/layouts/deep/hyphenated/name/application.html.erb" do |contents|
       assert_match "<title>Deep hyphenated name</title>", contents
@@ -652,7 +652,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_no_file "bukkits.gemspec"
     assert_file "Gemfile" do |contents|
       assert_no_match("gemspec", contents)
-      assert_match(/gem 'rails'/, contents)
+      assert_match(/gem "rails"/, contents)
     end
   end
 
@@ -661,7 +661,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_no_file "bukkits.gemspec"
     assert_file "Gemfile" do |contents|
       assert_no_match("gemspec", contents)
-      assert_match(/gem 'rails'/, contents)
+      assert_match(/gem "rails"/, contents)
     end
   end
 
@@ -885,7 +885,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
       if defined?(JRUBY_VERSION)
         assert_match(/group :development do\n  gem 'activerecord-jdbcsqlite3-adapter'\nend/, contents)
       else
-        assert_match(/group :development do\n  gem 'sqlite3'\nend/, contents)
+        assert_match(/group :development do\n  gem "sqlite3"\nend/, contents)
       end
     end
 
diff --git a/railties/test/generators/scaffold_generator_test.rb b/railties/test/generators/scaffold_generator_test.rb
index 6d374e85e8..a323e3aa10 100644
--- a/railties/test/generators/scaffold_generator_test.rb
+++ b/railties/test/generators/scaffold_generator_test.rb
@@ -570,17 +570,17 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/password: 'secret'/, content)
-      assert_match(/password_confirmation: 'secret'/, content)
+      assert_match(/password: "secret"/, content)
+      assert_match(/password_confirmation: "secret"/, content)
     end
 
     assert_file "test/system/users_test.rb" do |content|
-      assert_match(/fill_in "Password", with: 'secret'/, content)
-      assert_match(/fill_in "Password confirmation", with: 'secret'/, content)
+      assert_match(/fill_in "Password", with: "secret"/, content)
+      assert_match(/fill_in "Password confirmation", with: "secret"/, content)
     end
 
     assert_file "test/fixtures/users.yml" do |content|
-      assert_match(/password_digest: <%= BCrypt::Password.create\('secret'\) %>/, content)
+      assert_match(/password_digest: <%= BCrypt::Password.create\("secret"\) %>/, content)
     end
   end
 
diff --git a/railties/test/railties/generators_test.rb b/railties/test/railties/generators_test.rb
index 8383cb3050..51694a7d9b 100644
--- a/railties/test/railties/generators_test.rb
+++ b/railties/test/railties/generators_test.rb
@@ -79,7 +79,7 @@ module RailtiesTests
         bundled_rails("g model namespaced/topic")
         assert_file "app/models/foo_bar/namespaced.rb", /module FooBar\n  module Namespaced/ do |content|
           assert_class_method :table_name_prefix, content do |method_content|
-            assert_match(/'foo_bar_namespaced_'/, method_content)
+            assert_match(/"foo_bar_namespaced_"/, method_content)
           end
         end
       end