Testing & Mocking Packages
Testing frameworks, assertion libraries, and mocking tools for writing reliable unit, integration, and end-to-end tests (testify, pytest, Vitest).
Packages in Testing & Mocking
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pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
pytest-xdist
Distribute pytest test runs across multiple CPUs and hosts to cut suite runtime
pytest-mock
A pytest plugin that provides a `mocker` fixture wrapping Python's `unittest.mock`, with automatic teardown between tests.
pluggy
The minimalist, production-ready plugin and hook system that powers pytest, tox, and devpi
Faker
A Python library that generates realistic fake data for testing, seeding, and anonymizing datasets across 70+ locales.
hypothesis
Property-based testing for Python that generates edge cases and shrinks failures to their simplest reproducing example.
fake-useragent
Up-to-date user-agent string faker backed by a real-world browser usage database, bundled offline.
fakeredis
A pure-Python, in-memory implementation of the Redis protocol for testing.
pytest-order
Pytest plugin for running tests in a specific, controllable order
behave
A Python behavior-driven development framework that runs Gherkin feature files against step definitions written in plain Python.
testcontainers-python
Throwaway Docker containers for real integration tests, driven straight from Python.
pytest-html
A pytest plugin that turns your test run into an interactive, shareable HTML report.
mock
The rolling backport of Python's unittest.mock library
pytest-docker
Pytest fixtures that spin up Docker Compose services for integration tests, then tear them down automatically.
factory_boy
A versatile test fixtures replacement for Python, providing declarative factories for building complex test objects.
VCR.py
Record and replay HTTP interactions to speed up tests
pytest-cases
Separate test code from test cases in pytest, with fixture unions and parametrization goodies for readable, reusable test suites.
pytest-repeat
A pytest plugin for repeating tests a set number of times
DeepEval
A Pytest-like open-source framework for unit-testing and evaluating LLM applications with research-backed metrics.
pywinauto
A Python library that drives Windows GUI apps by sending mouse, keyboard, and text-based actions to dialogs and controls.
pytest-sugar
A pytest plugin that replaces the default test runner output with a live progress bar, instant failure display, and colorized results.
python-devtools
Python's missing debug print command, plus pretty formatting, timing, and pytest helpers.
time-machine
Travel through time in your Python tests by mocking datetime and time at the C level.
allure-pytest
A pytest plugin that generates rich, interactive Allure test reports with steps and attachments
