1 files changed, 32 insertions, 0 deletions
diff --git a/test/test_mutex_m.rb b/test/test_mutex_m.rb
index 30971dd352..e5cfbc8b5f 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -23,4 +23,36 @@ class TestMutexM < Test::Unit::TestCase
     c.signal
     assert_equal "abc", t.value
   end
+
+  class KeywordInitializeParent
+    def initialize(x:)
+    end
+  end
+
+  class KeywordInitializeChild < KeywordInitializeParent
+    include Mutex_m
+    def initialize
+      super(x: 1)
+    end
+  end
+
+  def test_initialize_with_keyword_arg
+    assert KeywordInitializeChild.new
+  end
+
+  class NoArgInitializeParent
+    def initialize
+    end
+  end
+
+  class NoArgInitializeChild < NoArgInitializeParent
+    include Mutex_m
+    def initialize
+      super()
+    end
+  end
+
+  def test_initialize_no_args
+    assert NoArgInitializeChild.new
+  end
 end