Improve tests

[dankeder]

This pull request improves Docopt tests. It's now possible to run tests by executing:

python setup.py test

[keleshev]

Sorry, not a big fan of these changes:

• python setup.py test will run unittest, not py.test in your case.
• Since you indented everything under class DocoptTest(unittest.TestCase):, now git blame will only show your single commit for every line in the test file—which makes it harder to figure out when and why each test was introduced.

If you fix these, I'll merge it. I agree that having a uniform way of launching tests (python setup.py test) is superior to what we have now (an assumption that everyone knows how to use py.test).

[dankeder]

Ok, I'll try to do something about that.

[dankeder]

I have updated the PR - running python setup.py test now uses pytest and I reverted changes to test_docopt.py.

Please let me know if you have any more suggestions.

[keleshev]

Thanks! Looks perfect now.