public void TestCreateCompositeKey()
        {
            ChaincodeStub stub = new ChaincodeStub("myc", "txId", handler.Object, new List <ByteString>(), null);
            CompositeKey  key  = stub.CreateCompositeKey("abc", "def", "ghi", "jkl", "mno");

            Assert.AreEqual(key.ObjectType, "abc");
            Assert.AreEqual(key.Attributes.Count, 4);
            Assert.AreEqual(key.ToString(), "\u0000abc\u0000def\u0000ghi\u0000jkl\u0000mno\u0000");
        }