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TEST-PLAN.md

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Test Plan

Below are a set of user interactions that are expected to work consistently across all Link-enabled apps. In order to provide the best user experience, it's important that apps behave consistently with respect to these test cases. ## Tempo Changes

TEMPO-1: Tempo changes should be transmitted between connected apps.

  • Open LinkHut, press Play and enable Link.
  • Open App and enable Link.
  • Without starting to play, change tempo in App ⇒ LinkHut clicks should speed up or slow down to match the tempo specified in the App.
  • Start playing in the App ⇒ App and LinkHut should be in sync
  • Change tempo in App and in LinkHut ⇒ App and LinkHut should remain in sync

TEMPO-2: Opening an app with Link enabled should not change the tempo of an existing Link session.

  • Open App and enable Link.
  • Set App tempo to 100bpm.
  • Terminate App.
  • Open LinkHut, press Play and enable Link.
  • Set LinkHut tempo to 130bpm.
  • Open App and enable Link. ⇒ Link should be connected (“1 Link”) and the App and LinkHut’s tempo should both be 130bpm.

TEMPO-3: When connected, loading a new document should not change the Link session tempo.

  • Open LinkHut, press Play and enable Link.
  • Set LinkHut tempo to 130bpm.
  • Open App and enable Link ⇒ LinkHut’s tempo should not change.
  • Load new Song/Set/Session with a tempo other than 130bpm ⇒ App and LinkHut tempo should both be 130bpm.

TEMPO-4: Tempo range handling.

  • Open LinkHut, press Play, enable Link.
  • Open App, start Audio, and enable Link.
  • Change tempo in LinkHut to 20bpm ⇒ App and LinkHut should stay in sync.
  • Change Tempo in LinkHut to 999bpm ⇒ App and LinkHut should stay in sync.
  • If App does not support the full range of tempos supported by Link, it should stay in sync by switching to a multiple of the Link session tempo.

TEMPO-5: Enabling Link does not change app's tempo if there is no Link session to join.

  • Open App, start playing.
  • Change App tempo to something other than the default.
  • Enable Link ⇒ App's tempo should not change.
  • Change App tempo to a new value (not the default).
  • Disable Link ⇒ App's tempo should not change.

Beat Time

These cases verify the continuity of beat time across Link operations.

BEATTIME-1: Enabling Link does not change app's beat time if there is no Link session to join.

  • Open App, start playing.
  • Enable Link ⇒ No beat time jump or audible discontinuity should occur.
  • Disable Link ⇒ No beat time jump or audible discontinuity should occur.

BEATTIME-2: App's beat time does not change if another participant joins its session.

  • Open App and enable Link.
  • Start playing.
  • Open LinkHut and enable Link ⇒ No beat time jump or audible discontinuity should occur in the App.

Note: When joining an existing Link session, an app should adjust to the existing session's tempo and phase, which will usually result in a beat time jump. Apps that are already in a session should never have any kind of beat time or audio discontinuity when a new participant joins the session.

Start Stop States

STARTSTOPSTATE-1: Listening to start/stop commands from other peers.

  • Open App, set Link and Start Stop Sync to Enabled.
  • Open LinkHut, enable Link and Start Stop Sync and press Play ⇒ App should start playing according to its quantization.
  • Stop playback in LinkHut ⇒ App should stop playing.

STARTSTOPSTATE-2: Sending start/stop commands to other peers.

  • Open LinkHut, enable Link and Start Stop Sync and press Play.
  • Open App, set Link and Start Stop Sync to Enabled ⇒ App should not be playing while LinkHut continues playing.
  • Start playback in App ⇒ App should join playing according to its quantization.
  • Stop playback in App ⇒ App and LinkHut should stop playing.
  • Start playback in App ⇒ App and LinkHut should start playing according to their quantizations.

Audio Engine

These cases verify the correct implementation of latency compensation within an app's audio engine.

AUDIOENGINE-1: Correct alignment of app audio with shared session

  • Connect the audio out of your computer to the audio in. Alternatively use SoundFlower to be able to record the output of your app and LinkHut.
  • Open LinkHut, enable Link and press Play.
  • Open App and enable Link.
  • Start playing audio (preferably a short, click-like sample) with notes on the same beats as LinkHut.
  • Record audio within application of choice.
  • Validate whether onset of the sample aligns with the pulse generated by LinkHut (tolerance: less than 3 ms).