public void Should_Implement_Fizz_Buzz()
 {
     Assert.Equal("buzz", FlowControl.FizzBuzz(5));
     Assert.Equal("1", FlowControl.FizzBuzz(1));
     Assert.Equal("fizzbuzz", FlowControl.FizzBuzz(90));
     Assert.Equal("fizz", FlowControl.FizzBuzz(9));
     Assert.Equal("7", FlowControl.FizzBuzz(7));
     Assert.Equal("fizzbuzz", FlowControl.FizzBuzz(8505));
     Assert.Equal("8506", FlowControl.FizzBuzz(8506));
 }