[brunov]

Most of the CS courses I've taken from Coursera already do all those things. The Algorithms course from Prof. Sedgewick in particular had an excellent test suite for its programming assignments.

You were graded on complying to an interface, code style, correctness, performance and memory usage, with strict requirements on the latter two. You couldn't get away with, say, implementing a brute force solution and calling it a day, you had to solve the problem optimally.