public void ShouldMapIntPropToNullableInt()
        {
            var data = new Model2 {
                IntProp = 123
            };

            var mapper = new ObjectMapper <Model2, Dto2>();

            mapper.Append(p => p.IntProp, p => (int?)p.IntProp);
            var target = data.Map(mapper);

            target.Should().BeEquivalentTo(new Dto2()
            {
                IntProp = 123
            });
        }