Get a full fake REST API with zero coding in less than 30 seconds (seriously)
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A toolkit with common assertions and mocks that plays nicely with the standard library
- testify
- go
- assertions
- mocking
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
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
- oas
- prism
- mocking
- api-testing
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
🎲 Mock or extend your GraphQL API with faked data. No coding required.
Get a full fake GraphQL API with zero coding in less than 30 seconds.
- graphql
- graphql-server
- express-graphql
An elegant library for stubbing HTTP requests with ease in Swift
vfsStream is a stream wrapper for a virtual file system that may be helpful in unit tests to mock the real file system. It can be used with any unit test framework, like PHPUnit or SimpleTest.
- vfsstream
- php
- testing
- filesystem
A collection of utilities for creating/testing/experimenting with service workers.
- service-worker
Mock Alamofire and URLSession requests without touching your code implementation
- wt-branch-protection-two-approvals
- wt-branch-protection-exempt
Replace any .NET method (including static and non-virtual) with a delegate
- testing
- testing-framework
- isolation-framework
- dotnet
A reasonably complete and well-tested golang port of httpbin, with zero dependencies outside the go stdlib.
Mock HTTPX with awesome request patterns and response side effects 🦋
Fake server, Consumer Driven Contracts and help with testing performance from one configuration file with zero system dependencies and no coding whatsoever
An Apex mocking framework for true unit testing in Salesforce, with Stub API support
Testing chrome extensions with Node.js
- javascript
- chrome-api
- sinon-chrome
- chrome-events
Scriptable, multipurpose mock server. Run standalone mock servers, or embed mocks within your tests or CI/CD pipeline.
Shift-left API Integration | Auto-fix integration drift before integration. Specmatic turns API specifications into executable contracts, continuously verifying that every change made by AI coding agents and engineers stays true to the desired behaviour. Ship AI-ready APIs 10x faster, from intent to implementation, with Spec-Driven API Development.
- contract-testing
- microservices
- contract-driven-development
- cdd
:dash: Simple yet powerful file-based mock server with recording abilities
Bouncy Hsm is a software simulator of HSM and smartcard simulator with HTML UI, REST API and PKCS#11 interface.
- blazor
- blazor-webassembly
- bouncycastle
- cryptography
SMTP mock server written on Golang. Mimic any 📤 SMTP server behavior for your test environment with fake SMTP server.
- smtp
- smtp-mock
- smtp-server
- smtp-mail