Do not depend on Rails git repository layout in ActiveSupport tests

activesupport/test/dependencies_test.rb

@@ -160,7 +160,7 @@ def test_circular_autoloading_detection
   def test_ensures_the_expected_constant_is_defined
     with_autoloading_fixtures do
       e = assert_raise(LoadError) { Typo }
-      assert_match %r{Unable to autoload constant Typo, expected .*activesupport/test/autoloading_fixtures/typo.rb to define it}, e.message
+      assert_match %r{Unable to autoload constant Typo, expected .*/test/autoloading_fixtures/typo.rb to define it}, e.message
     end
   end
 
@@ -178,7 +178,7 @@ def test_require_dependency_interaction_with_autoloading
       assert_equal 1, TypO
 
       e = assert_raise(LoadError) { Typo }
-      assert_match %r{Unable to autoload constant Typo, expected .*activesupport/test/autoloading_fixtures/typo.rb to define it}, e.message
+      assert_match %r{Unable to autoload constant Typo, expected .*/test/autoloading_fixtures/typo.rb to define it}, e.message
     end
   end