1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/module/extended_spec.rb b/spec/ruby/core/module/extended_spec.rb
new file mode 100644
index 0000000000..a4ec5a4ba7
--- /dev/null
+++ b/spec/ruby/core/module/extended_spec.rb
@@ -0,0 +1,44 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Module#extended" do
+  it "is called when an object gets extended with self" do
+    begin
+      m = Module.new do
+        def self.extended(o)
+          $extended_object = o
+        end
+      end
+
+      (o = mock('x')).extend(m)
+
+      $extended_object.should == o
+    ensure
+      $extended_object = nil
+    end
+  end
+
+  it "is called after Module#extend_object" do
+    begin
+      m = Module.new do
+        def self.extend_object(o)
+          $extended_object = nil
+        end
+
+        def self.extended(o)
+          $extended_object = o
+        end
+      end
+
+      (o = mock('x')).extend(m)
+
+      $extended_object.should == o
+    ensure
+      $extended_object = nil
+    end
+  end
+
+  it "is private in its default implementation" do
+    Module.new.private_methods.should.include?(:extended)
+  end
+end