public void MethodReturnTenArg()
        {
            TestClass      orig        = new TestClass();
            ITestInterface asInterface = ReflectedCaster.Default.CastToInterface <ITestInterface>(orig);

            string ret = asInterface.MethodReturnTenArg("Hello world", 1, "c", 2, "e", 3, "g", 4, "i", 5);

            Assert.Equal($"Hello world{1}c{2}e{3}g{4}i{5}", orig.ReturnCode);
            Assert.Equal($"Hello world{1}c{2}e{3}g{4}i{5}", ret);
        }