Failures running tests directly (without coverage command)

[rbtcollins]

Trying to run the tests directly (without using the coverage command) currently fails because unittest.begin() is not a valid method. This should be replaced with with unittest.main().

Fixing this (and running tests standalone) will break one of the formatannotation tests, as the expected result depends on how the tests are run.

From aliles#20, filed by @jstemmer