1 files changed, 21 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/object_and_class_ext_test.rb b/activesupport/test/core_ext/object_and_class_ext_test.rb
new file mode 100644
index 0000000000..5a0ae58837
--- /dev/null
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -0,0 +1,21 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../../lib/core_ext/object_and_class'
+
+class A; end
+class B < A; end
+class C < B; end
+class D < A; end
+
+class ClassExtTest < Test::Unit::TestCase
+  def test_methods
+    assert defined?(B)
+    assert defined?(C)
+    assert defined?(D)
+
+    A.remove_subclasses
+
+    assert !defined?(B)
+    assert !defined?(C)
+    assert !defined?(D)
+  end
+end