1 files changed, 21 insertions, 0 deletions
diff --git a/test/test_mutex_m.rb b/test/test_mutex_m.rb
index e5cfbc8b5f..f938e71729 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -55,4 +55,25 @@ class TestMutexM < Test::Unit::TestCase
   def test_initialize_no_args
     assert NoArgInitializeChild.new
   end
+
+  def test_alias_extended_object
+    object = Object.new
+    object.extend(Mutex_m)
+
+    assert object.respond_to?(:locked?)
+    assert object.respond_to?(:lock)
+    assert object.respond_to?(:unlock)
+    assert object.respond_to?(:try_lock)
+    assert object.respond_to?(:synchronize)
+  end
+
+  def test_alias_included_class
+    object = NoArgInitializeChild.new
+
+    assert object.respond_to?(:locked?)
+    assert object.respond_to?(:lock)
+    assert object.respond_to?(:unlock)
+    assert object.respond_to?(:try_lock)
+    assert object.respond_to?(:synchronize)
+  end
 end