public void IsValid()
        {
            var item = new IllnessHistoryDto()
            {
                Patient = new LightPatientDto(),
            };

            Assert.IsTrue(item.IsValid());
        }
        public void IsInvalid()
        {
            var item = new IllnessHistoryDto()
            {
                Patient = null,
            };

            Assert.IsFalse(item.IsValid());
        }