diff --git a/activerecord/test/cases/fixtures_test.rb b/activerecord/test/cases/fixtures_test.rb
index 67b37c81d9..bcff4b1180 100644
--- a/activerecord/test/cases/fixtures_test.rb
+++ b/activerecord/test/cases/fixtures_test.rb
@@ -32,7 +32,6 @@ require "models/task"
 require "models/topic"
 require "models/traffic_light"
 require "models/treasure"
-require "tempfile"
 
 class FixturesTest < ActiveRecord::TestCase
   include ConnectionHelper
diff --git a/activesupport/test/ordered_options_test.rb b/activesupport/test/ordered_options_test.rb
index 75e39ec2a3..5743c5682b 100644
--- a/activesupport/test/ordered_options_test.rb
+++ b/activesupport/test/ordered_options_test.rb
@@ -41,9 +41,9 @@ class OrderedOptionsTest < ActiveSupport::TestCase
 
     a[:test_key] = 56
     assert_equal 56, a.test_key
-    assert_equal 56, a['test_key']
+    assert_equal 56, a["test_key"]
     assert_equal 56, a.dig(:test_key)
-    assert_equal 56, a.dig('test_key')
+    assert_equal 56, a.dig("test_key")
   end
 
   def test_method_access
diff --git a/railties/test/commands/credentials_test.rb b/railties/test/commands/credentials_test.rb
index 83bf8cac11..ffaef6eac3 100644
--- a/railties/test/commands/credentials_test.rb
+++ b/railties/test/commands/credentials_test.rb
@@ -5,7 +5,6 @@ require "env_helpers"
 require "rails/command"
 require "rails/commands/credentials/credentials_command"
 require "fileutils"
-require "tempfile"
 
 class Rails::Command::CredentialsCommandTest < ActiveSupport::TestCase
   include ActiveSupport::Testing::Isolation, EnvHelpers