public void WhoWillSurvive_ArgumentExeption()
 {
     Assert.Throws <ArgumentException>(() => CountJosephFlavius.WhoWillSurvive(10, 0));
     Assert.Throws <ArgumentException>(() => CountJosephFlavius.WhoWillSurvive(-18, 4));
 }
 public int WhoWillSurviveTest(int count, int step)
 => CountJosephFlavius.WhoWillSurvive(count, step);