Most popular Mocking framework for unit tests written in Java
- mockito
- java
- mocking-framework
- testing-tools
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An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
Test spies, stubs and mocks for JavaScript.
- stubs
- javascript
- tdd
- test-driven-development
Test Automation Made Simple
- test-automation
- assertions
- testing-tools
- mock-server
Catches mail and serves it through a dream.
- smtp
- server
- ruby
smtp4dev - the fake smtp email server for development and testing
HTTP Toolkit is a beautiful & open-source tool for debugging, testing and building with HTTP(S) on Windows, Linux & Mac :tada: Open an issue here to give feedback or ask for help.
- feedback
- developer-tools
- http
Papercut SMTP -- The Simple Desktop Email Server
DummyJSON.com provides different types of REST Endpoints filled with JSON data which you can use in developing the frontend with your favorite framework and library without worrying about writing a backend.
- json
- json-api
- json-server
- javascript
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
- api-simulation
- golang
- proxy
- mitm
CppUTest unit testing and mocking framework for C/C++
- cpputest
- unit-testing
- test-driven-development
- c-plus-plus
Embedded unit testing framework for Godot 4 supporting GDScript and C#. Features test-driven development, embedded test inspector, extensive assertions, mocking, scene testing.
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
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
Simplify software testing, by easily mocking any system using HTTP/HTTPS, allowing a team to test and develop against a service that is not complete or is unstable or just to reproduce planned/edge cases.
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
High-performance, multi-protocol mock server. HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, SOAP in one binary.
- api-mocking
- cli
- developer-tools
- golang
TestBox is a cutting-edge testing and mocking framework for the BoxLang JVM language and ColdFusion (CFML), built on Behavior-Driven Development (BDD) to offer a clear and intuitive syntax for writing tests.
DNS mock server written on 💎 Ruby. Mimic any DNS records for your test environment with fake DNS server.
A lightweight Snowflake emulator built with Go and DuckDB for local development and testing
localaik is a local compatibility server for a subset of the Gemini and OpenAI APIs. Run one container locally, point your SDK to it, and the proxy serves both protocol shapes on the same port for tests and development.