Unit tests

Not just for Test Driven Development
Test bug fixes
Re-factoring insurance

Presenter notes

Hard to get manager buy-in b/c it takes longer usually up-front
Release early, find bugs, write tests, repeat

Unit test benefits

Improves documentation of bug fix
Answer 5 Ws
- http://en.wikipedia.org/wiki/Five_Ws
Future-proof code against duplicate bugs
- Old bugs have tendency to come back

Presenter notes

Think executable documentation!
Document how you tested it, what the bug scenario was
Good unit test is best doc for weird bug fix
- test will include comments, data to re-create bug, steps for scenario
Refactoring has a tendency to allow old bugs to creep in

Unit test downsides

Hard to run
Not usually located close to real code
Some environments hard to duplicate
False positives

Presenter notes

Doctests are nice b/c they are right there with code but can be ugly
- Problems for documentation generators like sphinx?

Unit test tools

Pytest
Nose
doctests
Travis CI

Presenter notes

Tools to help mitigate the hard to run aspect of tests