diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index e2649a908f..e6c107961d 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -866,6 +866,64 @@ class TestModule < Test::Unit::TestCase
     assert_equal mod.instance_method(:a=), memo.shift
   end
 
+  def test_method_undefined
+    added = []
+    undefed = []
+    removed = []
+    mod = Module.new do
+      mod = self
+      def f
+      end
+      (class << self ; self ; end).class_eval do
+        define_method :method_added do |sym|
+          added << sym
+        end
+        define_method :method_undefined do |sym|
+          undefed << sym
+        end
+        define_method :method_removed do |sym|
+          removed << sym
+        end
+      end
+    end
+    assert_method_defined?(mod, :f)
+    mod.module_eval do
+      undef :f
+    end
+    assert_equal [], added
+    assert_equal [:f], undefed
+    assert_equal [], removed
+  end
+
+  def test_method_removed
+    added = []
+    undefed = []
+    removed = []
+    mod = Module.new do
+      mod = self
+      def f
+      end
+      (class << self ; self ; end).class_eval do
+        define_method :method_added do |sym|
+          added << sym
+        end
+        define_method :method_undefined do |sym|
+          undefed << sym
+        end
+        define_method :method_removed do |sym|
+          removed << sym
+        end
+      end
+    end
+    assert_method_defined?(mod, :f)
+    mod.module_eval do
+      remove_method :f
+    end
+    assert_equal [], added
+    assert_equal [], undefed
+    assert_equal [:f], removed
+  end
+
   def test_method_redefinition
     feature2155 = '[ruby-dev:39400]'