public void Countdown_bestimmen()
        {
            var config = new KonfigurationAdapter();
            var sut = new Wiedervorlage(config);

            var c = sut.Countdown_bestimmen("*****@*****.**");
            Assert.AreEqual(new TimeSpan(0,0,10,0), c);

            c = sut.Countdown_bestimmen("*****@*****.**");
            Assert.AreEqual(new TimeSpan(0, 99, 0, 0), c);

            c = sut.Countdown_bestimmen("*****@*****.**");
            Assert.AreEqual(new TimeSpan(5, 0, 0, 0), c);
        }
 public void Countdown_bestimmen_mit_falscher_Syntax()
 {
     var config = new KonfigurationAdapter();
     var sut = new Wiedervorlage(config);
     Assert.Throws<InvalidOperationException>(() => sut.Countdown_bestimmen("*****@*****.**"));
 }