should return two if 1, 1 is entered test passing
should return 3 if 1, 2 is entered test passing
should return 28 if 1, 2, 3, 4, 5, 6, 7 is entered test passing
should return 28 if 1, 2, 3, 4, 5, 6, 7 is entered test refactored
should return 28 if 1, 2, 3, 4, 5, 6, 7 is entered test refactored again
Allow the Add method to handle new lines between numbers (instead of commas). test passing
handles support for different delimeters test passing... super easy??
throws error if negative number entered test passing
ALL TESZZT PASSING