Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
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Free, open-source AWS emulator. LocalStack alternative: 107 services, 7,657 operations, true 100% Smithy conformance (257,522/257,522 variants pass). No account, no auth token, no paid tier.
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
HTTP mock for Golang: record and replay HTTP/HTTPS interactions for offline testing
Advanced unit test framework for D
- testing
- unittest
- unit-testing
- property-based-testing
FakeServer integrates with ExUnit to make external APIs testing simpler
- elixir
- test
- fake-server
- exunit
Isolate tests from the real world, inspired by Ruby's VCR.
- elixir
- testing
- integration
Lightweight mongo mocking for Vert.x
A simple framework for writing effective unit, component, and integration tests.
Open-source Modbus RTU/TCP slave simulator for the LRI AEM-60DC8 industrial DC monitor — 147 holding registers, 8 DC channels, 6 baudrates. SCADA/PLC integration testing without hardware.