PyTest test discovery

Running pytest will find test files and in the files test functions.

• test_*.py files
• *_test.py files
• test_* functions
• TestSomething class
• test_* methods

examples/pytest/discovery
.
├── db
│   └── test_db.py
├── other_file.py
├── test_one.py
└── two_test.py

============================= test session starts ==============================
platform linux -- Python 3.8.6, pytest-6.1.2, py-1.9.0, pluggy-0.13.1 -- /home/gabor/venv3/bin/python
cachedir: .pytest_cache
plugins: json-report-1.2.4, random-order-1.0.4, flake8-1.0.6, forked-1.3.0, dash-1.17.0, metadata-1.11.0, xdist-2.2.1
collecting ... collected 3 items

test_one.py::test_1 PASSED                                               [ 33%]
two_test.py::test_2 PASSED                                               [ 66%]
db/test_db.py::test_db PASSED                                            [100%]

============================== 3 passed in 0.02s ===============================