This won't work as expected. In the current implementation, it joined the arguments with a space, so that if you executed

    $ fab test:api,core,accounts

it would translate to:

    $ python manage.py test api core accounts

Now, since each string needs a prefix, you need to prefix each arg with './huxley' and then join it with a space. The fabfile has an `env.huxley_root` variable that points to the project root. Steps:
- For each arg, you'll need to:`join(env.huxley_root, 'huxley', arg)` to build the path to the app (NOTE: that's os.path.join, which is already imported in this file). This is a one-liner with a list comprehension.
- Join that list of strings into one string separated by spaces with `' '.join(result)`. This is already done, you just pass in the `result` instead of `args`.