1 files changed, 5 insertions, 2 deletions
diff --git a/spec/ruby/core/hash/merge_spec.rb b/spec/ruby/core/hash/merge_spec.rb
index 5ea70610be..e90beae87a 100644
--- a/spec/ruby/core/hash/merge_spec.rb
+++ b/spec/ruby/core/hash/merge_spec.rb
@@ -69,9 +69,12 @@ describe "Hash#merge" do
       result.should == { a: 1, b: 2, c: 3, d: 4 }
     end
 
-    it "accepts zero arguments and returns self" do
+    it "accepts zero arguments and returns a copy of self" do
       hash = { a: 1 }
-      hash.merge.should eql(hash)
+      merged = hash.merge
+
+      merged.should eql(hash)
+      merged.should_not equal(hash)
     end
   end
 end