public void Input_25_Should_Be_2()
 {
     Assert.AreEqual(2, Persist.Persistence(25));
 }
 public void Input_39_Should_Be_3()
 {
     Assert.AreEqual(3, Persist.Persistence(39));
 }
 public void Input_999_Should_Be_4()
 {
     Assert.AreEqual(4, Persist.Persistence(999));
 }
 public void Input_11_Should_Be_1()
 {
     Assert.AreEqual(1, Persist.Persistence(11));
 }
 public void DigitMutiply_Input_123_Should_Be_6()
 {
     Assert.AreEqual(6, Persist.DigitMutiply(123));
 }
 public void DigitMutiply_Input_11_Should_Be_1()
 {
     Assert.AreEqual(1, Persist.DigitMutiply(11));
 }
 public void Mutiply_Input_0_Should_Be_0()
 {
     Assert.AreEqual(0, Persist.DigitMutiply(0));
 }
 public void Input_0_Should_Be_0()
 {
     Assert.AreEqual(0, Persist.Persistence(0));
 }