public void fb2Output20()
 {
     Assert.AreEqual(fb2.getOutput(), "1 2 fizz 4 buzz fizz 7 8 fizz buzz 11 fizz 13 14 fizzbuzz 16 17 fizz 19 buzz");
 }
 public void fb1Output()
 {
     Assert.AreEqual(fb1.getOutput(), "fizzbuzz");
 }