public static void AddScroll_Should_Not_Add_When_Param_Is_Null()
        {
            // arrange
            var           descriptor = new SearchDescriptor <object>();
            ScrollOptions options    = null;

            // act
            descriptor.AddScroll(options);

            // assert
            var resultAsString = SerializeUtil.Serialize(descriptor);

            Assert.Equal("{}", resultAsString);
        }