1 files changed, 20 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/initialize_dup_spec.rb b/spec/ruby/core/kernel/initialize_dup_spec.rb
new file mode 100644
index 0000000000..6dff34b7ad
--- /dev/null
+++ b/spec/ruby/core/kernel/initialize_dup_spec.rb
@@ -0,0 +1,20 @@
+require_relative '../../spec_helper'
+
+describe "Kernel#initialize_dup" do
+  it "is a private instance method" do
+    Kernel.should have_private_instance_method(:initialize_dup)
+  end
+
+  it "returns the receiver" do
+    a = Object.new
+    b = Object.new
+    a.send(:initialize_dup, b).should == a
+  end
+
+  it "calls #initialize_copy" do
+    a = Object.new
+    b = Object.new
+    a.should_receive(:initialize_copy).with(b)
+    a.send(:initialize_dup, b)
+  end
+end