Testing from zero to advancedFree

Pytest

From a first assert to fixtures, parametrize, mocking, coverage and writing your own plugin — the whole road to testing Python code. Six steps and a ten-question quiz in every chapter.

The six steps in every chapter

1Encounter
2Understand
3Worked
4Predict
5Apply
6Stretch

00Before you write a test — what you actually need50 min10 questionsRead Play· 9 min
01Installing pytest and your first test40 min10 questionsRead Play· 8 min
02assert and reading failure reports45 min10 questionsRead Play· 9 min
03Discovery and running tests — what pytest runs, and how to choose45 min10 questionsRead Play· 9 min
04Testing exceptions — pytest.raises45 min10 questionsRead Play· 8 min
05Floats and pytest.approx — testing "close enough"35 min10 questionsRead Play· 8 min
06parametrize — one test, many cases45 min10 questionsRead Play· 8 min
07Fixtures — setup written once45 min10 questionsRead Play· 9 min
08Fixture scope and conftest.py — sharing setup safely50 min10 questionsRead Play· 9 min
09Built-in fixtures — tmp_path, capsys and caplog45 min10 questionsRead Play· 8 min
10monkeypatch — controlling the environment, time and the network50 min10 questionsRead Play· 9 min
11Mocking — checking how an external service was called50 min10 questionsRead Play· 9 min
12Markers, skip and xfail — which tests run where50 min10 questionsRead Play· 9 min
13Configuration and warnings — the rules in one file55 min10 questionsRead Play· 9 min
14Coverage and CI — which lines did your tests never run?50 min10 questionsRead Play· 9 min
15Async tests, hooks and writing a plugin60 min10 questionsRead Play· 9 min
16Test design and TDD — what makes a good test60 min10 questionsRead Play· 9 min