public string GetFahrenToKelvin(float val)
 {
     return(string.Format("{0} ºC são {1} K", val, ConvertTemperature.FahrenToKelvin(val)));
 }
 public void ValidFahrenToKelvin()
 {
     Assert.Equal(273.15f, ConvertTemperature.FahrenToKelvin(32f));
 }