public void TestReturnFizz()
{
FizzBuzz fizzbuzz = new FizzBuzz();
Assert.AreEqual(fizzbuzz.Play(3), "Fizz");
Assert.AreEqual(fizzbuzz.Play(6), "Fizz");
}
public void TestReturnNumber()
{
FizzBuzz fizzbuzz = new FizzBuzz();
Assert.AreEqual(fizzbuzz.Play(1), "1");
}