Isolate tests from the real world, inspired by Ruby's VCR.
- elixir
- testing
- integration
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🤖 A simulated HTTP server for testing client code with configurable responses.
Simple injectable test dependencies for Elixir
A small spying and stubbing library for Clojure and ClojureScript
a version of pythons unittest.Mock with async methods
Golang HTTP client testing framework
- oss
- golang
- library
- testing
Utility for testing applications based on CycleJS framework.
A testing library that allows "time travel," "freezing time," and "time acceleration". Inspired by the ruby-timecop library.
- testing
- timecop
- crystal
Load popup, sidebar and background with JSDOM based on the manifest.json for testing purposes
In-memory WebExtensions API Fake Implementation for testing purposes
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.
Lightweight mongo mocking for Vert.x
Unit test your 🐍 smart contracts
Simple and colorful test tools
Feature-rich filesystem mocking for Go tests: comprehensive error injection, latency simulation, write operations, operation statistics, and standalone file handles. Built on testing/fstest.MapFS with comprehensive fs.FS interface support.
- filesystem
- go
- golang
- mock
Open-source simulation harness for testing AI agents. Simulate LLM and tool calls to test edge cases, failure paths, and agent logic without live API calls.
- ai-agents
- ai-testing
- llm
- llm-evaluation
Automatically generate Go code for mocking interfaces in unit tests