object.c: undef Module#prepend_features on Class

* object.c (Init_Object): undef Module#prepend_features on Class, as
  well as Module#append_features.  [Fixes GH-376]
* test_class.rb: Added test for above. And ensure type checking
  on similar methods as module_function.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42541 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 26 insertions, 0 deletions

diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index 47848f3184..b40cab8050 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -105,6 +105,32 @@ class TestClass < Test::Unit::TestCase
     end
   end
 
+  def test_extend_object
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:extend_object).bind(c).call(Object.new)
+    end
+  end
+
+  def test_append_features
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:append_features).bind(c).call(Module.new)
+    end
+  end
+
+  def test_prepend_features
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:prepend_features).bind(c).call(Module.new)
+    end
+  end
+
+  def test_module_specific_methods
+    assert_empty(Class.private_instance_methods(true) &
+      [:module_function, :extend_object, :append_features, :prepend_features])
+  end
+
   def test_method_redefinition
     feature2155 = '[ruby-dev:39400]'