We've covered Fizz. We've covered Buzz. And, we've covered FizzBuzz. Now we must account for numbers that are divisible by neither 3 nor 5. Remember, in the event that a number is divisible by neither 3 nor 5, we simply return the number supplied. Let's take a look at this test:
[Fact]
public void Given1Then1()
{
// Arrange
// Act
var result = FizzBuzz(1);
// Assert
Assert.Equal(1, result);
}