TDD with Python

A talk about TDD for PythonPH's September 2014 meet-up. The meet-up was held at Chikka's HQ and I was a Chikka employee then.

Transcript

1. Test Driven Development (with Python and Chad Estioco)
2. Chad n. chocolate-consuming, code-churning, curious creature currently codes for Chikka’s Connectiviteam (sic)
3. self.assertEquals(TDD, unit tests)
4. Test, test, test, and test. And when you no longer want to test, drag your (team mate’s) @** and test some more! ~ Chad Estioco
5. Python is test-friendly :)
6. batteries included? WOWZERS! import unittest class SchoolTest(unittest.TestCase): … unittest.main()
7. anatomy of a unit-test - the set-up - the tests (duhh) - the tear-down
8. anatomy of a unit-test - the set-up → def setUp(self): - the tests (duhh) → def test*(self): - the tear-down → def tearDown (self):
9. how to use unit tests simple! just run all of them, every time to ensure that nothing is broken.
10. time for a quick count at ~2.5K commits tornado has roughly 42 test modules at ~19k commits django has roughly 1267 test modules
11. wait. all of them? everytime?
12. though this be madness we have methods for this!
13. Python has nose! (unlike Lord Voldemort, fond of snakes)
14. enter continuous integration while True: red green refactor
15. ideally, we want to test every line of our code.
16. method to the madness: code coverage tools
17. self.assertTrue(coverage == confidence)
18. honorable mentions: selenium
19. honorable mentions: vaurien
20. Sorry, I lied.
21. TDD is not about writing unit tests.
22. It is about writing testable code, to begin with.
23. Questions?