public void Convert_PassValidValue_MustReturnConvertedValue()
        {
            const string convertingValue = "3,45";
            const double expextedValue = 3.45;
            var converter = new StringToDoubleConveter();
            var result = converter.Convert(convertingValue, typeof(Double), null, null);

            Assert.AreEqual(expextedValue, result);
        }
 public void Convert_PassInvalidValue_ThrowsArgumentException()
 {
     const string convertingValue = "3,45a";
     var converter = new StringToDoubleConveter();
     Assert.Throws<ArgumentException>(() => converter.Convert(convertingValue, typeof(Double), null, null));
 }