Tests

[Jonathan Verner]

Could someone help me (nudge me in the right direction) with running the brython tests? I've looked into the www/tests subdirectory, but I couldn't quite figure out how to use the tests that are present. I'd like to write tests for the changes I am contributing (somehow it doesn't feel right to test them manually) and also I wonder if we could try to run them automatically on the Travis CI (it seems that this was possible in the past but now it doesn't work).