Delete orphan autoloading fixtures

Rails now delegates autoloading to Zeitwerk, and therefore does not need to test
autoloading itself. Zeitwerk has test coverage, in Rails we only need to test
the integration.

We are gradually trimming AS::Dependencies, and the AS test suite. With the
removal of DependenciesTestHelpers and client code in af27a25, these fixtures
became orphan.

Three of them are left. They are to be autoloaded with Module#autoload because
they raise errors when the file is evaluated. Their current use cases are
already committed.

activesupport/test/autoloading_fixtures/a/b.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class A::B
-end

activesupport/test/autoloading_fixtures/a/c/d.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class A::C::D
-end

activesupport/test/autoloading_fixtures/a/c/em/f.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class A::C::EM::F
-end

activesupport/test/autoloading_fixtures/application.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-ApplicationController = 10

activesupport/test/autoloading_fixtures/circular1.rb

@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-silence_warnings do
-  Circular2
-end
-
-class Circular1
-end

activesupport/test/autoloading_fixtures/circular2.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-Circular1
-
-class Circular2
-end

activesupport/test/autoloading_fixtures/class_folder.rb

@@ -1,5 +0,0 @@
-# frozen_string_literal: true
-
-class ClassFolder
-  ConstantInClassFolder = "indeed"
-end

activesupport/test/autoloading_fixtures/class_folder/class_folder_subclass.rb

@@ -1,5 +0,0 @@
-# frozen_string_literal: true
-
-class ClassFolder::ClassFolderSubclass < ClassFolder
-  ConstantInClassFolder = "indeed"
-end

activesupport/test/autoloading_fixtures/class_folder/inline_class.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class ClassFolder::InlineClass
-end

activesupport/test/autoloading_fixtures/class_folder/nested_class.rb

@@ -1,9 +0,0 @@
-# frozen_string_literal: true
-
-class ClassFolder
-  class NestedClass
-  end
-
-  class SiblingClass
-  end
-end

activesupport/test/autoloading_fixtures/conflict.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-Conflict = 2

activesupport/test/autoloading_fixtures/counting_loader.rb

@@ -1,7 +0,0 @@
-# frozen_string_literal: true
-
-$counting_loaded_times ||= 0
-$counting_loaded_times += 1
-
-module CountingLoader
-end

activesupport/test/autoloading_fixtures/cross_site_dependency.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class CrossSiteDependency
-end

activesupport/test/autoloading_fixtures/d.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class D
-end

activesupport/test/autoloading_fixtures/em.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class EM
-end

activesupport/test/autoloading_fixtures/html/some_class.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-module HTML
-  class SomeClass
-  end
-end

activesupport/test/autoloading_fixtures/load_path/loaded_constant.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-module LoadedConstant
-end

activesupport/test/autoloading_fixtures/loads_constant.rb

@@ -1,7 +0,0 @@
-# frozen_string_literal: true
-
-module LoadsConstant
-end
-
-# The _ = assignment is to prevent warnings
-_ = RequiresConstant

activesupport/test/autoloading_fixtures/module_folder/inline_class.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class ModuleFolder::InlineClass
-end

activesupport/test/autoloading_fixtures/module_folder/nested_class.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-module ModuleFolder
-  class NestedClass
-  end
-end

activesupport/test/autoloading_fixtures/module_folder/nested_sibling.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class ModuleFolder::NestedSibling
-end

activesupport/test/autoloading_fixtures/module_folder/nested_with_require.rb

@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-require "dependencies/module_folder/lib_class"
-
-module ModuleFolder
-  class NestedWithRequire
-  end
-end

activesupport/test/autoloading_fixtures/module_with_custom_const_missing/a/b.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-ModuleWithCustomConstMissing::A::B = "10"

activesupport/test/autoloading_fixtures/multiple_constant_file.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-MultipleConstantFile = 10
-SiblingConstant = MultipleConstantFile * 2

activesupport/test/autoloading_fixtures/nested_with_require_parent.rb

@@ -1,5 +0,0 @@
-# frozen_string_literal: true
-
-class NestedWithRequireParent
-  ModuleFolder::NestedWithRequire
-end

activesupport/test/autoloading_fixtures/prepend.rb

@@ -1,10 +0,0 @@
-# frozen_string_literal: true
-
-class SubClassConflict
-end
-
-class Prepend
-  module PrependedModule
-  end
-  prepend PrependedModule
-end

activesupport/test/autoloading_fixtures/prepend/sub_class_conflict.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class Prepend::SubClassConflict
-end

activesupport/test/autoloading_fixtures/raises_arbitrary_exception.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-RaisesArbitraryException = 1
-_ = A::B # Autoloading recursion, also expected to be watched and discarded.
-
-raise Exception, "arbitrary exception message"

activesupport/test/autoloading_fixtures/requires_constant.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-require "loaded_constant"
-
-module RequiresConstant
-end

activesupport/test/autoloading_fixtures/should_not_be_required.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-ShouldNotBeAutoloaded = 0

activesupport/test/autoloading_fixtures/throws.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-Throws = 1
-_ = A::B # Autoloading recursion, expected to be discarded.
-
-throw :t

activesupport/test/autoloading_fixtures/typo.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-TypO = 1