Hey Mozilla devs, are you sick of typing TEST_PATH=... make -C objdir mochitest-browser-chrome only to remember halfway through that you're trying to run an XPC shell test, and have to type something completely different? Me too!
There's currently at least 7 makefile targets for running the common unit tests (mochitests, reftests and XPC shell tests). It's a pain remembering which one to use. So I've created a Python script which will do it for you, and you'll only need one command to run tests ever again:
../scripts/runtest.py path/to/test
"Where do I get this magic script?" you ask. It's here. It could be more efficient, it could be better documented, and it could be written by someone who actually knows what they're doing with Python. Who cares? It works.