Why I use tests

• you code can work.
• make sure that when you change you code, you won't break it.
• think more than usual.

Nose

write some tests, then use nose

$ pip install nose
$ nosetests -v

Pytest

$ pip install pytest
$ py.test -v path/to/test/dir

可以使用插件，比如说覆盖度和 pep8 检查

$ pip install pytest-cove pytest-pep8
$ py.test -v --pep8 --cov=path/to/test/dir path/to/test/dir

Reference

• improve-your-python-understanding-unit-testing
• unittest