Writing unit tests in Python: How do I start?
I completed my first proper project in Python and now my task is to write tests for it.
Since this is the first time I did a project, this is the first time I would be writing tests for it.
The question is, how do I start? I have absolutely no idea. Can anyone point me to some documentation/ tutorial/ link/ book that I can use to start with writing tests (and I guess unit testing in particular)
Any advice will be welcomed on this topic.
This is a tutorial for test-driven development in Python. Now, like Justin said, it's better to write your tests before or during coding, and that's how this tutorial assumes you're working, but I still think you'll find it helpful.
And here's part 2.
The free Python book Dive Into Python has a chapter on unit testing that you might find useful.
If you follow modern practices you should probably write the tests while you are writing your project, and not wait until your project is nearly finished.
Bit late now, but now you know for next time. :)
If you're brand new to using unittests, the simplest approach to learn is often the best. On that basis along I recommend using py.test rather than the default unittest module.
Consider these two examples, which do the same thing:
Example 1 (unittest):
import unittest
class LearningCase(unittest.TestCase):
def test_starting_out(self):
self.assertEqual(1, 1)
def main():
unittest.main()
if __name__ == "__main__":
main()
Example 2 (pytest):
def test_starting_out():
assert 1 == 1
Assuming that both files are named test_unittesting.py , how do we run the tests?
Example 1 (unittest):
cd /path/to/dir/
python test_unittesting.py
Example 2 (pytest):
cd /path/to/dir/
py.test
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