Fix `Module#const_defined?` on inherited constants

[Fix GH-2061]

From: manga_osyo <manga.osyo@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66938 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index d5c66be1ec..3bd438ef6e 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -338,6 +338,17 @@ class TestModule < Test::Unit::TestCase
     assert_raise(NameError) {self.class.const_defined?(const)}
   end
 
+  def test_nested_defined_inheritance
+    assert_send([Object, :const_defined?, [self.class.name, 'User', 'MIXIN'].join('::')])
+    assert_send([self.class, :const_defined?, 'User::MIXIN'])
+    assert_send([Object, :const_defined?, 'File::SEEK_SET'])
+
+    # const_defined? with `false`
+    assert_not_send([Object, :const_defined?, [self.class.name, 'User', 'MIXIN'].join('::'), false])
+    assert_not_send([self.class, :const_defined?, 'User::MIXIN', false])
+    assert_not_send([Object, :const_defined?, 'File::SEEK_SET', false])
+  end
+
   def test_nested_defined_bad_class
     assert_raise(TypeError) do
       self.class.const_defined?('User::USER::Foo')