diff --git a/actioncable/test/channel/stream_test.rb b/actioncable/test/channel/stream_test.rb
index bfe1f92946..f2fe8b4ce7 100644
--- a/actioncable/test/channel/stream_test.rb
+++ b/actioncable/test/channel/stream_test.rb
@@ -26,16 +26,17 @@ module ActionCable::StreamTests
       transmit_subscription_confirmation
     end
 
-    private def pick_coder(coder)
-      case coder
-      when nil, "json"
-        ActiveSupport::JSON
-      when "custom"
-        DummyEncoder
-      when "none"
-        nil
+    private
+      def pick_coder(coder)
+        case coder
+        when nil, "json"
+          ActiveSupport::JSON
+        when "custom"
+          DummyEncoder
+        when "none"
+          nil
+        end
       end
-    end
   end
 
   module DummyEncoder
diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index 45f69d5375..f647896374 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -36,12 +36,14 @@ ActionMailer::Base.view_paths = FIXTURE_LOAD_PATH
 class ActiveSupport::TestCase
   include ActiveSupport::Testing::MethodCallAssertions
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
+
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 end
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index f4787ed27a..0e394d28f1 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -430,14 +430,16 @@ end
 class ActiveSupport::TestCase
   include ActiveSupport::Testing::MethodCallAssertions
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
+
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 end
 
 class DrivenByRackTest < ActionDispatch::SystemTestCase
diff --git a/actionpack/test/controller/new_base/render_context_test.rb b/actionpack/test/controller/new_base/render_context_test.rb
index 07fbadae9f..5e570a1d79 100644
--- a/actionpack/test/controller/new_base/render_context_test.rb
+++ b/actionpack/test/controller/new_base/render_context_test.rb
@@ -32,10 +32,11 @@ module RenderContext
       "controller context!"
     end
 
-    # 3) Set view_context to self
-    private def view_context
-      self
-    end
+    private
+      # 3) Set view_context to self
+      def view_context
+        self
+      end
   end
 
   class RenderContextTest < Rack::TestCase
diff --git a/actionview/test/abstract_unit.rb b/actionview/test/abstract_unit.rb
index f20a66c2d2..db46420022 100644
--- a/actionview/test/abstract_unit.rb
+++ b/actionview/test/abstract_unit.rb
@@ -225,12 +225,14 @@ class ActiveSupport::TestCase
   include ActionDispatch::DrawOnce
   include ActiveSupport::Testing::MethodCallAssertions
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
+
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 end
diff --git a/actionview/test/template/form_helper/form_with_test.rb b/actionview/test/template/form_helper/form_with_test.rb
index 876e799d93..70325c27bd 100644
--- a/actionview/test/template/form_helper/form_with_test.rb
+++ b/actionview/test/template/form_helper/form_with_test.rb
@@ -450,13 +450,15 @@ class FormWithActsLikeFormForTest < FormWithTest
 
   def test_form_with_doesnt_call_private_or_protected_properties_on_form_object_skipping_value
     obj = Class.new do
-      private def private_property
-        "That would be great."
-      end
+      private
+        def private_property
+          "That would be great."
+        end
 
-      protected def protected_property
-        "I believe you have my stapler."
-      end
+      protected
+        def protected_property
+          "I believe you have my stapler."
+        end
     end.new
 
     form_with(model: obj, scope: "other_name", url: "/", id: "edit-other-name") do |f|
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 91fb9d0a7c..138b1d1bb9 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -14,12 +14,14 @@ require "active_support/testing/method_call_assertions"
 class ActiveModel::TestCase < ActiveSupport::TestCase
   include ActiveSupport::Testing::MethodCallAssertions
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
+
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 end
diff --git a/activesupport/test/abstract_unit.rb b/activesupport/test/abstract_unit.rb
index f214898145..168d3655d3 100644
--- a/activesupport/test/abstract_unit.rb
+++ b/activesupport/test/abstract_unit.rb
@@ -29,17 +29,18 @@ I18n.enforce_available_locales = false
 class ActiveSupport::TestCase
   include ActiveSupport::Testing::MethodCallAssertions
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
 
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 
-  def frozen_error_class
-    Object.const_defined?(:FrozenError) ? FrozenError : RuntimeError
-  end
+    def frozen_error_class
+      Object.const_defined?(:FrozenError) ? FrozenError : RuntimeError
+    end
 end
diff --git a/railties/test/abstract_unit.rb b/railties/test/abstract_unit.rb
index b42f37d6b9..9c866263f0 100644
--- a/railties/test/abstract_unit.rb
+++ b/railties/test/abstract_unit.rb
@@ -21,12 +21,14 @@ end
 class ActiveSupport::TestCase
   include ActiveSupport::Testing::Stream
 
-  # Skips the current run on Rubinius using Minitest::Assertions#skip
-  private def rubinius_skip(message = "")
-    skip message if RUBY_ENGINE == "rbx"
-  end
-  # Skips the current run on JRuby using Minitest::Assertions#skip
-  private def jruby_skip(message = "")
-    skip message if defined?(JRUBY_VERSION)
-  end
+  private
+    # Skips the current run on Rubinius using Minitest::Assertions#skip
+    def rubinius_skip(message = "")
+      skip message if RUBY_ENGINE == "rbx"
+    end
+
+    # Skips the current run on JRuby using Minitest::Assertions#skip
+    def jruby_skip(message = "")
+      skip message if defined?(JRUBY_VERSION)
+    end
 end