Python Testing with pytest

Separating Code into src and tests Directories

Suppose we have a bunch of scripts and a bunch of tests for those scripts, and our directory is getting a bit cluttered. So we decide to move the scripts into a src directory and the tests into a tests directory, like this:

script_src
├── src
│   └── hello.py
├── tests
│   └── test_hello.py
└── pytest.ini

Without any other changes, pytest will blow up:

$ cd /path/to/code/ch12/script_src
$ pytest --tb=short -c pytest_bad.ini
========================= test session starts ==========================
collected 0 items / 1 error

================================ ERRORS ================================
_________________ ERROR collecting tests/test_hello.py _________________ ...