Testing MIDI applications
summary
Three open source tools let automated tests bypass physical gear: midi-test creates virtual MIDI ports (visible to any MIDI app) on Mac and Linux, emits and logs real MIDI messages and can simulate Web MIDI via JZZ; web-midi-test is a pure‑JavaScript fake Web MIDI API for unit tests and corner cases like denied MIDI or missing SysEx permission; test-midi-files generates readable JS MIDI files and a player. A headless bridge jazz-midi-headless wires JZZ into Puppeteer/Playwright so end‑to‑end tests run and the tools are used successfully by OSS.
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