public static void CalculateSum_NegativeInput_ExceptionIsThrown(int number)
{
// Arrange
Action act = () => AliquotSumCalculator.CalculateAliquotSum(number);
// Assert
act.Should().Throw <ArgumentException>();
}
public static void CalculateSum_SumIsCorrect(int number, int expectedSum)
{
// Arrange
// Act
var result = AliquotSumCalculator.CalculateAliquotSum(number);
// Assert
result.Should().Be(expectedSum);
}