public void IsValid_NullValue_NonNullableType()
        {
            var result = _converterForInt.IsValid(null);

            Assert.That(result, Is.False);
        }
        public void IsValid_NullValue_NullableType()
        {
            var result = _converterForObject.IsValid(null);

            Assert.That(result, Is.True);
        }