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Light, fluffy, and always free - The AWS Local Emulator alternative
A toolkit with common assertions and mocks that plays nicely with the standard library
- testify
- go
- assertions
- mocking
Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
HTTP Request & Response Service, written in Python + Flask.
- http
- http-server
- testing
- service
An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
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).
- mockery
- phpunit
- php
- stub
Record, Replay, and Stub HTTP Interactions.
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
- wiremock
- json
- mocking
- stubbing
A mock code autogenerator for Go
Catches mail and serves it through a dream.
- smtp
- server
- ruby
Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
A client-side server to build, test and share your JavaScript app
:wrench: Utility library for GraphQL to build, stitch and mock GraphQL schemas in the SDL-first approach
- graphql-schema
- schema-language
- graphql
- graphql-api
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
- mock-server
- proxy
- java-client
- javascript-client
Let your Python tests travel through time
Easy Setup Stub Server
A utility for mocking out the Python Requests library.
- tag-production
PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.
Library for stubbing and setting expectations on HTTP requests in Ruby.
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.