1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/core/module/initialize_copy_spec.rb b/spec/ruby/core/module/initialize_copy_spec.rb
new file mode 100644
index 0000000000..7ae48f85a9
--- /dev/null
+++ b/spec/ruby/core/module/initialize_copy_spec.rb
@@ -0,0 +1,18 @@
+require_relative '../../spec_helper'
+
+describe "Module#initialize_copy" do
+  it "should retain singleton methods when duped" do
+    mod = Module.new
+    def mod.hello
+    end
+    mod.dup.methods(false).should == [:hello]
+  end
+
+  # jruby/jruby#5245, https://bugs.ruby-lang.org/issues/3461
+  it "should produce a duped module with inspectable class methods" do
+    mod = Module.new
+    def mod.hello
+    end
+    mod.dup.method(:hello).inspect.should =~ /Module.*hello/
+  end
+end