With some recent changes to fix a bug whereby creating post-commit review

requests wasn't creating the draft object, a couple unit tests broke. The

problem here was that the draft's repository object wasn't the same as the

one that the review request is initialized with (because it fetches it

separately), so the spies weren't overriding the right methods.
I've fixed these up, and also cleaned up the code to initialize the Commit

objects with the intended message instead of assigning it after creation.

Ran unit tests.