GoogleTest - Google Testing and Mocking Framework

A toolkit with common assertions and mocks that plays nicely with the standard library

Industry standard API mocking for JavaScript.

A neural network that transforms a design mock-up into a static website.

Most popular Mocking framework for unit tests written in Java

HTTP server mocking and expectations library for Node.js

A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com

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).

Test spies, stubs and mocks for JavaScript.

GoMock is a mocking framework for the Go programming language.

A persistent service that generates mock data quickly and provids visualization view.

Highly opinionated mocking framework for PHP 5.3+

A library that allows you to easily mock out tests based on AWS infrastructure.

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

A mock code autogenerator for Go

Sql mock driver for golang to test database interactions

The most popular and friendly mocking framework for .NET

mocking library for Kotlin

:wrench: Utility library for GraphQL to build, stitch and mock GraphQL schemas in the SDL-first approach

Mock Object library for PHPUnit

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

MockServer enables easy mocking of any system you integrate with via HTTP or HTTPS with clients written in Java, JavaScript and Ruby. MockServer also includes a proxy that introspects all proxied traffic including encrypted SSL traffic and supports Port Forwarding, Web Proxying (i.e. HTTP proxy), HTTPS Tunneling Proxying (using HTTP CONNECT) and SOCKS Proxying (i.e. dynamic port forwarding).

A utility for mocking out the Python Requests library.

Axios adapter that allows to easily mock requests

A gem providing "time travel", "time freezing", and "time acceleration" capabilities, making it simple to test time-dependent code. It provides a unified method to mock Time.now, Date.today, and DateTime.now in a single call.

GoMock is a mocking framework for the Go programming language.

Pester is the ubiquitous test and mock framework for PowerShell.

Automatically mock your HTTP interactions to simplify and speed up testing

A friendly substitute for .NET mocking libraries.