1test_noargs
2	Example program is called without arguments so that default range
3	[0..9] is used.
4
5test_2_to_2000
6	Example program is called with "2" and "2000" as arguments.
7
8test_overflow
9	Example program is called with "0" and "100000" as arguments. The
10	resulting sum is too large to be stored as an int variable.
11