As a teacher of IT courses, I'd love a tool that would make it easy for me to set up "TDD" assignments and manage student submissions and grading. For example, I teach a SQL database course. I'd like to tell students that they need to build a database such that queries A, B, C succeed and D, E, F fail. They would upload their schema (the CREATE TABLE code), the test suite would run, and they'd see the score and decide if they wanted to try again. This minimizes the grading work, and by making the test suite transparent, helps the students learn.

It would be very tedious to build tests for one assignment, and there'd be a risk of cheating if every student had to pass the exact same tests. If the product were a "platform" however, teachers could share the assignments (and test suites) they defined, so pretty soon it would be possible for me to assign a different database project to each student in my class, with a different test suite, by drawing on the content library.