public void Test1()
 {
     Assert.AreEqual(27, Persist.MultiplyDigits(39));
     Console.WriteLine("****** Basic Tests");
     Assert.AreEqual(3, Persist.Persistence(39));
     Assert.AreEqual(0, Persist.Persistence(4));
     Assert.AreEqual(2, Persist.Persistence(25));
     Assert.AreEqual(4, Persist.Persistence(999));
 }