Add test for method_defined?(notimplement)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64341 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/-ext-/test_notimplement.rb

@@ -12,4 +12,8 @@ class Test_NotImplement < Test::Unit::TestCase
   def test_respond_to
     assert_not_respond_to(Bug, :notimplement)
   end
+
+  def test_not_method_defined
+    assert !Bug.method_defined?(:notimplement)
+  end
 end