Add the beginnings of unit test support for the Review Bot extension.
Review Request #12092 — Created Feb. 28, 2022 and submitted
This adds a basic test runner and
TestCaseclass for building unit
tests for the Review Bot extension.
Currently, this uses nose, which is not really the direction we want to
go. However, we previously had some issues with getting pytest working
on Review Board 4/Python 2, so for now we're using nose, with the plan
to move to pytest in the future.
Tested with upcoming changes adding unit tests.