public void TransformsToNullTest(string value)
        {
            var target = new OptionalStringConverter();

            string result = target.Transform(value);

            Assert.Null(result);
        }
        public void TransformStringValueTest()
        {
            var target = new OptionalStringConverter();

            string value = "any value   ";
            string result = target.Transform(value);

            Assert.Equal(value, result);
        }