Ensure all-caps nested consts marked as autoloaded

Previously, an autoloaded constant `HTML::SomeClass` would not be marked
as autoloaded by AS::Dependencies. This is because the
`#loadable_constants_for_path` method uses `String#camelize` on the
inferred file path, which in turn means that, unless otherwise directed,
AS::Dependencies watches for loaded constants in the `Html` namespace.

By passing the original qualified constant name to `#load_or_require`,
this inference step is avoided, and the new constant is picked up in the
correct namespace.

2 files changed, 12 insertions, 0 deletions

diff --git a/activesupport/test/autoloading_fixtures/html/some_class.rb b/activesupport/test/autoloading_fixtures/html/some_class.rb
new file mode 100644
index 0000000000..b43d15d891
--- /dev/null
+++ b/activesupport/test/autoloading_fixtures/html/some_class.rb
@@ -0,0 +1,4 @@
+module HTML
+  class SomeClass
+  end
+end
diff --git a/activesupport/test/dependencies_test.rb b/activesupport/test/dependencies_test.rb
index 68b6cc6e8c..9b84e75902 100644
--- a/activesupport/test/dependencies_test.rb
+++ b/activesupport/test/dependencies_test.rb
@@ -647,6 +647,14 @@ class DependenciesTest < ActiveSupport::TestCase
     Object.class_eval { remove_const :E }
   end
 
+  def test_constants_in_capitalized_nesting_marked_as_autoloaded
+    with_autoloading_fixtures do
+      ActiveSupport::Dependencies.load_missing_constant(HTML, "SomeClass")
+
+      assert ActiveSupport::Dependencies.autoloaded?("HTML::SomeClass")
+    end
+  end
+
   def test_unloadable
     with_autoloading_fixtures do
       Object.const_set :M, Module.new