public void ZeroTest()
 {
     Assert.AreEqual(GCDEuclidRecursive.GreatestCommonDivisor(5, 0), 5);
 }
 public void BasicTest()
 {
     Assert.AreEqual(GCDEuclidRecursive.GreatestCommonDivisor(10, 5), 5);
     Assert.AreEqual(GCDEuclidRecursive.GreatestCommonDivisor(5, 10), 5);
 }