Very handy: if you uncomment the `--pdb` argument in `NOSE_ARGS` in `lms/envs/test.py`, it will drop you into pdb on error. This lets you go up and down the stack and see what the values of the variables are. Check out http://docs.python.org/library/pdb.html
## Testing using queue servers
When testing problems that use a queue server on AWS (e.g. sandbox-xqueue.edx.org), you'll need to run your server on your public IP, like so.