public void FourEuro_ResultIsEndedByEuroSign()
        {
            var result = sut.Split(4);

            Assert.That(result[result.Length - 1], Is.EqualTo('€'));
            Assert.IsTrue(result.EndsWith("€"));
        }
 public void Impossible()
 {
     Assert.That(sut.Split(511.15), Is.EqualTo("IMPOSSIBLE"));
 }