Python reference

pytest
cheat sheet.

pytest collection, assertions, fixtures, parametrization, mocks, async tests, plugins, and command-line options.

26 topics60 code examplesUpdated 21 Oct 2026

How pytest fits together

01WriteName a function test_* and assert a result.

02Collectpytest discovers files and test cases.

03Set upFixtures supply reusable test data.

04ReportEach case passes, fails, skips or errors.

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4 chapters · 26 topics

CHAPTER 01 / 04

Write assertions, select tests, manage fixtures, parametrize cases, mock dependencies, and configure a test run.

12 topics

CHAPTER 02 / 04

Organize shared setup, test asynchronous code and service boundaries, and use plugins effectively.

5 topics

CHAPTER 03 / 04

Extend fixtures and parametrization, customize collection, write plugins, and diagnose slow or failing tests.

7 topics

CHAPTER 04 / 04

Find specialized built-ins, testing terminology, and documentation for further reference.

2 topics