public void NullDoubleTypeConverter_ConvertCoreWithEmptyString_Converts()
        {
            string source = string.Empty;

            var result = NullDoubleTypeConverter.Convert(source);

            Assert.IsNull(result);
        }
        public void NullDoubleTypeConverter_ConvertCoreWithValidString_Converts()
        {
            double number = 5;
            string source = number.ToString();

            var result = NullDoubleTypeConverter.Convert(source);

            Assert.IsNotNull(result);
            Assert.IsTrue(result == number);
        }