Already initialized modules cannot be replaced [Bug #17048]

1 files changed, 26 insertions, 14 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 98c9128406..bbe84cd9ff 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -404,19 +404,20 @@ class TestModule < Test::Unit::TestCase
     assert_equal([:MIXIN, :USER], User.constants.sort)
   end
 
-  def test_self_initialize_copy
-    bug9535 = '[ruby-dev:47989] [Bug #9535]'
-    m = Module.new do
-      def foo
-        :ok
-      end
-      initialize_copy(self)
+  def test_initialize_copy
+    mod = Module.new { define_method(:foo) {:first} }
+    klass = Class.new { include mod }
+    instance = klass.new
+    assert_equal(:first, instance.foo)
+    new_mod = Module.new { define_method(:foo) { :second } }
+    assert_raise(TypeError) do
+      mod.send(:initialize_copy, new_mod)
     end
-    assert_equal(:ok, Object.new.extend(m).foo, bug9535)
+    4.times { GC.start }
+    assert_equal(:first, instance.foo) # [BUG] unreachable
   end
 
   def test_initialize_copy_empty
-    bug9813 = '[ruby-dev:48182] [Bug #9813]'
     m = Module.new do
       def x
       end
@@ -426,12 +427,11 @@ class TestModule < Test::Unit::TestCase
     assert_equal([:x], m.instance_methods)
     assert_equal([:@x], m.instance_variables)
     assert_equal([:X], m.constants)
-    m.module_eval do
-      initialize_copy(Module.new)
+    assert_raise(TypeError) do
+      m.module_eval do
+        initialize_copy(Module.new)
+      end
     end
-    assert_empty(m.instance_methods, bug9813)
-    assert_empty(m.instance_variables, bug9813)
-    assert_empty(m.constants, bug9813)
   end
 
   def test_dup
@@ -3094,6 +3094,18 @@ class TestModule < Test::Unit::TestCase
     assert_match(/::Foo$/, mod.name, '[Bug #14895]')
   end
 
+  def test_include_allocated
+    assert_raise(ArgumentError) do
+      Module.new {include Module.allocate}
+    end
+    assert_raise(ArgumentError) do
+      Module.new {prepend Module.allocate}
+    end
+    assert_raise(ArgumentError) do
+      Object.new.extend Module.allocate
+    end
+  end
+
   private
 
   def assert_top_method_is_private(method)