Audio System Test

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

All tool calls go through npx iwsdk from the example workspace. The helper below keeps the existing MCP-style tool names, but it resolves them through iwsdk mcp inspect and then executes the matching CLI command directly.

Configuration:

• EXAMPLE_DIR: /Users/felixz/Projects/immersive-web-sdk/examples/audio
• ROOT: /Users/felixz/Projects/immersive-web-sdk

SHORTHAND: Throughout this document, MCPCALL means this shell function:

MCPCALL() {
  local tool=""
  local args=""
  local timeout=""
  while [ "$#" -gt 0 ]; do
    case "$1" in
      --tool) tool="$2"; shift 2 ;;
      --args) args="$2"; shift 2 ;;
      --timeout) timeout="$2"; shift 2 ;;
      *) echo "Unknown argument: $1" >&2; return 1 ;;
    esac
  done

  node --input-type=module - "$tool" "${args:-}" "${timeout:-}" <<'EOF'
import { spawnSync } from 'node:child_process';

const [toolName, rawArgs, timeout] = process.argv.slice(2);
const inspect = spawnSync('npx', ['iwsdk', 'mcp', 'inspect'], {
  cwd: process.cwd(),
  encoding: 'utf8',
});
if (inspect.status !== 0) {
  if (inspect.stderr) process.stderr.write(inspect.stderr);
  process.exit(inspect.status ?? 1);
}

const parsed = JSON.parse(inspect.stdout);
const tool = parsed.data.tools.find((entry) => entry.mcpName === toolName);
if (!tool) {
  console.error(`Unknown tool: ${toolName}`);
  process.exit(1);
}

const cliArgs = ['iwsdk', ...tool.cliPath.split(' ')];
if (rawArgs) cliArgs.push('--input-json', rawArgs);
if (timeout) cliArgs.push('--timeout', timeout);

const result = spawnSync('npx', cliArgs, {
  cwd: process.cwd(),
  encoding: 'utf8',
});
if (result.stdout) process.stdout.write(result.stdout);
if (result.stderr) process.stderr.write(result.stderr);
process.exit(result.status ?? 1);
EOF
}

Tool calling pattern: Every tool call is a Bash command using the MCPCALL shorthand:

MCPCALL --tool <TOOL_NAME> --args '<JSON_ARGS>' 2>/dev/null

• <TOOL_NAME> uses MCP-style names (e.g. browser_reload_page, xr_accept_session). The shell helper resolves them to direct CLI commands.
• <JSON_ARGS> is a JSON object string. Omit --args if no arguments needed.
• Output is JSON on stdout. Parse it to check assertions.
• Use --timeout 20000 for operations that may take longer (reload, accept_session, screenshot).
• Running from the example workspace (or a child directory within it) is required so npx iwsdk can resolve the nearest IWSDK app root.

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 MCPCALL 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 /Users/felixz/Projects/immersive-web-sdk/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 /Users/felixz/Projects/immersive-web-sdk/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 dev status from the example directory until state.running becomes true. You do not need to extract or manage the port yourself; all subsequent MCPCALL commands resolve the active runtime through the CLI.

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

Step 3: Verify Connectivity

MCPCALL --tool ecs_list_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. MCPCALL --tool browser_reload_page --timeout 20000 2>/dev/null Then: sleep 3

2. MCPCALL --tool xr_accept_session --timeout 20000 2>/dev/null Then: sleep 2

3. MCPCALL --tool browser_get_console_logs --args '{"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

MCPCALL --tool ecs_find_entities --args '{"withComponents":["AudioSource"]}' 2>/dev/null

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

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

Test 1.2: Verify Loaded State

MCPCALL --tool ecs_query_entity --args '{"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

MCPCALL --tool ecs_set_component --args '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_playRequested","value":true}' 2>/dev/null

Assert: _playRequested was consumed (response shows newValue: false — the AudioSystem processed it within the same frame).

Test 2.2: Play with Loop for Observable State

Set loop: true first, then request play:

MCPCALL --tool ecs_set_component --args '{"entityIndex":<audio>,"componentId":"AudioSource","field":"loop","value":true}' 2>/dev/null

MCPCALL --tool ecs_set_component --args '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_playRequested","value":true}' 2>/dev/null

Then query:

MCPCALL --tool ecs_query_entity --args '{"entityIndex":<audio>,"components":["AudioSource"]}' 2>/dev/null

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

Suite 3: Stop

Test 3.1: Request Stop

MCPCALL --tool ecs_set_component --args '{"entityIndex":<audio>,"componentId":"AudioSource","field":"_stopRequested","value":true}' 2>/dev/null

Assert: _stopRequested consumed, _isPlaying becomes false.

Suite 4: System Registration

MCPCALL --tool ecs_list_systems 2>/dev/null

Assert:

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

Suite 5: Component Schema

MCPCALL --tool ecs_list_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

MCPCALL --tool browser_get_console_logs --args '{"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 /Users/felixz/Projects/immersive-web-sdk/examples/audio && npx iwsdk 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 /Users/felixz/Projects/immersive-web-sdk/examples/audio && npx iwsdk 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 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 GLXF level

The audio example loads entities from ./glxf/Composition.glxf. Entities are not created in index.js — they come from the GLXF composition. Use ecs_find_entities to discover them dynamically.

Boolean values must be JSON booleans

When setting boolean fields (like _playRequested, loop, _stopRequested) via 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 ecs_find_entities.