Audio System Test

Run 6 test suites covering audio loading, playback trigger, stop, system registration, component schema, and stability.

Configuration:

• EXAMPLE_DIR: $IWSDK_REPO_ROOT/examples/audio

Tool calls: every tool call is npx @iwsdk/cli <subcommand> [--input-json '<JSON>'] [--timeout <ms>], run from inside the example workspace (cwd $EXAMPLE_DIR). The CLI auto-discovers the IWSDK app root from cwd, so no path tricks are required. Run npx @iwsdk/cli mcp inspect from the example to discover available tools and their CLI subcommands.

• <JSON> is a JSON object string. Omit --input-json if no arguments are needed.
• Output is JSON on stdout: {ok, workspaceRoot, operation, result}. Parse it to check assertions.
• Use --timeout 20000 for operations that may take longer (reload, xr enter, screenshot).

IMPORTANT: Run each Bash command one at a time. Parse the JSON output and verify assertions before moving to the next command. Do NOT chain multiple CLI commands together.

IMPORTANT: When the instructions say "wait N seconds", use sleep N as a separate Bash command.

IMPORTANT: Boolean values in ecs set-component must be actual JSON booleans (value: true), NOT strings (value: "true"). Strings silently fail to coerce.

Step 1: Install Dependencies

cd $IWSDK_REPO_ROOT/examples/audio && npm run fresh:install

Wait for this to complete before proceeding.

Step 2: Start Dev Server

Start the dev server as a background task using the Bash tool's run_in_background: true parameter:

cd $IWSDK_REPO_ROOT/examples/audio && npm run dev

IMPORTANT: This command MUST be run with run_in_background: true on the Bash tool — do NOT append & to the command itself.

Once the background task is launched, poll the output for Vite's ready message (up to 60s). You can also run npx @iwsdk/cli dev status from the example directory until state.running becomes true. You do not need to extract or manage the port yourself; subsequent commands resolve the active runtime through the CLI automatically.

If the server fails to start within 60 seconds, report FAIL for all suites and skip to Step 5.

Step 3: Verify Connectivity

npx @iwsdk/cli ecs systems 2>/dev/null

This must return JSON with a list of systems. If it fails:

1. Check the dev server output for errors
2. Try killing and restarting the server (Step 2)
3. If it still fails, report FAIL for all suites and skip to Step 5

Step 4: Run Test Suites

Pre-test Setup

Run these commands in order:

1. npx @iwsdk/cli browser reload --timeout 20000 2>/dev/null Then: sleep 3

2. npx @iwsdk/cli xr enter --timeout 20000 2>/dev/null Then: sleep 2

3. npx @iwsdk/cli browser logs --input-json '{"count":20,"level":["error"]}' 2>/dev/null Assert: No error-level logs. Audio autoplay warnings are acceptable.

Suite 1: Audio Loading

Test 1.1: Find Audio Entity

npx @iwsdk/cli ecs find --input-json '{"withComponents":["AudioSource"]}' 2>/dev/null

Assert: At least 1 entity. Save the first as <audio>.

The audio example uses a native scene level that creates entities via composition. The Spinner entity has an AudioSource.

Test 1.2: Verify Loaded State

npx @iwsdk/cli ecs query --input-json '{"entityIndex":<audio>,"components":["AudioSource"]}' 2>/dev/null

Assert:

• src contains an audio file path (e.g., .mp3)
• _loaded = true (buffer loaded)
• _loading = false (not currently loading)
• _isPlaying = false (not playing yet — unless autoplay is set)
• volume = 1
• positional = true

Test 1.3: Pool Created Assert: _pool exists with available array matching maxInstances.

Suite 2: Playback Trigger

Test 2.1: Request Play

npx @iwsdk/cli ecs set-component --input-json '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_playRequested","value":true}' 2>/dev/null

The set response may briefly show newValue: true. Wait one frame, then query the component and assert _playRequested is false; the AudioSystem consumes the request asynchronously.

sleep 1

npx @iwsdk/cli ecs query --input-json '{"entityIndex":<audio>,"components":["AudioSource"]}' 2>/dev/null

Test 2.2: Play with Loop for Observable State

Set loop: true first, then request play:

npx @iwsdk/cli ecs set-component --input-json '{"entityIndex":<audio>,"componentId":"AudioSource","field":"loop","value":true}' 2>/dev/null

npx @iwsdk/cli ecs set-component --input-json '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_playRequested","value":true}' 2>/dev/null

Then query:

npx @iwsdk/cli ecs query --input-json '{"entityIndex":<audio>,"components":["AudioSource"]}' 2>/dev/null

Assert: _isPlaying = true (looping sound keeps playing).

Suite 3: Stop

Test 3.1: Request Stop

npx @iwsdk/cli ecs set-component --input-json '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_stopRequested","value":true}' 2>/dev/null

Assert: _stopRequested consumed, _isPlaying becomes false.

Suite 4: System Registration

npx @iwsdk/cli ecs systems 2>/dev/null

Assert:

• AudioSystem at priority 0
• Config keys: enableDistanceCulling, cullingDistanceMultiplier
• audioEntities >= 1

Suite 5: Component Schema

npx @iwsdk/cli ecs components 2>/dev/null

Assert AudioSource fields:

• Core: src (FilePath), volume (Float32), loop (Boolean), autoplay (Boolean)
• Spatial: positional (Boolean), refDistance, rolloffFactor, maxDistance, distanceModel, coneInnerAngle, coneOuterAngle, coneOuterGain
• Behavior: playbackMode (Enum), maxInstances (Int8), crossfadeDuration (Float32), instanceStealPolicy (Enum)
• Control: _playRequested, _pauseRequested, _stopRequested (Boolean), _fadeIn, _fadeOut (Float32)
• State: _pool (Object), _instances (Object), _isPlaying (Boolean), _buffer (Object), _loaded, _loading (Boolean)

Suite 6: Stability

npx @iwsdk/cli browser logs --input-json '{"count":30,"level":["error","warn"]}' 2>/dev/null

Assert: No application-level errors. Audio autoplay warnings and pre-existing 404 resource errors from page load are acceptable.

Step 5: Cleanup & Results

Kill the dev server:

cd $IWSDK_REPO_ROOT/examples/audio && npx @iwsdk/cli dev down

Output a summary table:

| Suite                    | Result    |
|--------------------------|-----------|
| 1. Audio Loading         | PASS/FAIL |
| 2. Playback Trigger      | PASS/FAIL |
| 3. Stop                  | PASS/FAIL |
| 4. System Registration   | PASS/FAIL |
| 5. Component Schema      | PASS/FAIL |
| 6. Stability             | PASS/FAIL |

If any suite fails, include which assertion failed and actual vs expected values.

Recovery

If at any point a transient error occurs (server crash, WebSocket timeout, connection refused, etc.) that is NOT caused by a source code bug:

1. Stop the dev server: cd $IWSDK_REPO_ROOT/examples/audio && npx @iwsdk/cli dev down
2. Restart: re-run Step 2 to start a fresh dev server
3. Re-run the Pre-test Setup (reload, accept session)
4. Retry the failed suite

Only give up after one retry attempt per suite. If the same suite fails twice, mark it FAIL and continue to the next suite.

Known Issues & Workarounds

Request flags are one-shot

_playRequested, _pauseRequested, and _stopRequested are consumed by the AudioSystem within one frame. The npx @iwsdk/cli ecs set-component response may already show newValue: false.

Short sounds finish before query

Non-looping sounds may finish playing before you can query _isPlaying. Set loop: true before playing to observe a persistent _isPlaying: true state.

Stop priority

If _stopRequested and _playRequested are set simultaneously, stop wins.

Audio output not verifiable

IWER runs in a browser context where the AudioContext may be suspended until a user gesture. The MCP tools can verify ECS state transitions but cannot confirm actual audio output.

Audio example uses native scene JSON

The audio example loads entities from ./scenes/audio.iwsdk.scene.json. Most entities are not created in index.js; they come from the scene document. Use npx @iwsdk/cli ecs find to discover them dynamically.

Boolean values must be JSON booleans

When setting boolean fields (like _playRequested, loop, _stopRequested) via npx @iwsdk/cli ecs set-component, the value must be a JSON boolean (true), not a string ("true"). Strings silently fail.

Entity indices change on reload

Never cache entity indices across page reloads. Always re-discover via npx @iwsdk/cli ecs find.