What do we do?

"Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: first the developer writes an (initially failing) automated test case that defines a desired improvement or new function, then produces the minimum amount of code to pass that test, and finally refactors the new code to acceptable standards." -- Wikipedia
Here, we apply TDD to help students to test & fix their code, and have a fair grading policy relative to time and assignments specifications.