IMO we shouldn't have to jump through hoops to be able to commit. Let people commit whatever they want and then run tests to decide if you want to merge in their branches. The workflow should encourage people to commit early and often to safeguard the work they've been doing as much as possible. It's very frustrating to lose work because it wasn't in the git object store.
True, although I've used something similar that compiles the code and runs tests, if they failed it asked if I still wanted to commit. It was just a quick check that I was probably committing what I thought I was.