Mocking Python Packages

vcrpy

Automatically mock your HTTP interactions to simplify and speed up testing

mongomock

Small library for mocking pymongo collection objects for testing purposes

aioresponses

Aioresponses is a helper for mock/fake web requests in python aiohttp package.

pyfakefs

Provides a fake file system that mocks the Python file system modules.

httpretty

Intercept HTTP requests at the Python socket level. Fakes the whole socket module

cassetter

Rust-powered HTTP cassette recorder for Python tests. Safe by default.

pook

HTTP traffic mocking and testing made easy in Python

django-mock-queries

A library for mocking django queryset functions in memory for testing

mocket

a socket mock framework - for all kinds of socket animals, web-clients included

callee

Argument matchers for unittest.mock

mock-alchemy

SQLAlchemy mock helpers.

flexmock

Mock/stub/spy library for Python

openmock

Python Opensearch Mock for test purposes (fork of elasticmock)

pytest-mongodb

pytest plugin for mocking MongoDB with fixtures

montydb

Monty, Mongo tinified. MongoDB implemented in Python !

pychoir

A Simple Unit Test Matcher Library for Python 3.6+

pytest-when

Pytest plugin for more readable mocking

cmd-mox

Python-native command mocking

nala

🦁 Nala - A delightful test framework for C projects.

pymox

Pymox - Python mocking on steroids

mockstack

An API mocking workhorse 🐎

mocksafe

Type-safe mocking for Python.

evalcraft

Deterministic $0 pytest assertions for AI agents — catch the agent that quietly stopped calling its tools, and cost blowups, offline in CI.

chainmock

Mocking library for Python