public void Less_Than_Zero_Returns_Minus_One()
{
// Arrange
// Act
var result = MathsF.Factorial(-1);
// Assert
Assert.Equal(-1, result);
}
public void Returns_Correct_Result(long input, long expected)
{
// Arrange
// Act
var result = MathsF.Factorial(input);
// Assert
Assert.Equal(expected, result);
}