public void CheckInputTest()
{
//Arrange
FizzBuzz fizzBuzz = new FizzBuzz();
//Asser
Assert.AreEqual(5, fizzBuzz.CheckInput("5"));
Assert.AreEqual(0, fizzBuzz.CheckInput("k"));
Assert.AreEqual(0, fizzBuzz.CheckInput("305"));
Assert.AreEqual(0, fizzBuzz.CheckInput("-1"));
Assert.AreEqual(0, fizzBuzz.CheckInput("0"));
Assert.AreEqual(42, fizzBuzz.CheckInput("42"));
Assert.AreEqual(90, fizzBuzz.CheckInput("90"));
}