Mocking GitHub Repositories (2026) · Open Source Tools

The industry standard for API mocking in JavaScript.

Unit testing and build system for C projects

Angular testing library for mocking components, directives, pipes, services and facilitating TestBed setup

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

A tool for mocking HTTP services

Automatically mock your HTTP interactions to simplify and speed up testing

Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java, but extended and different functionality. Full documentation can be found at https://wiremock.org/dotnet/.

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

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

A unit testing framework for TypeScript backends working with inversion of control and dependency injection

A mocking library based on the Compiler APIs (Roslyn + Mocks)

A library for mocking django queryset functions in memory for testing

ESM import and globals mocking for unit tests

Super simple HTTP server that replies a fixed body with a fixed response code

Swift Mocking Library

Mocking library with the perfect balance of Performance and Intuitive API

A minimal test double library for TDD with JavaScript