Environment System Test

Run 6 test suites covering default lighting verification, system registration, component registration, scene hierarchy, ECS data modification, 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/poke
• 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/poke && 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/poke && 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","warn"]}' 2>/dev/null Assert: No error-level logs.

Suite 1: Default Lighting Verification

Test 1.1: Find LevelRoot Dynamically

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

Assert: Exactly 1 entity. Save its entityIndex as <root>.

Test 1.2: LevelRoot Has Environment Components

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

Assert: Both components present with default values:

DomeGradient defaults:

IBLGradient defaults:

Key detail: DomeGradient and IBLGradient have different sky defaults.

Suite 2: System Registration

Test 2.1: EnvironmentSystem Present

MCPCALL --tool ecs_list_systems 2>/dev/null

Assert:

• EnvironmentSystem at priority 0
• Query entity counts: domeGradients: 1, iblGradients: 1, domeTextures: 0, iblTextures: 0

Suite 3: Component Registration

Test 3.1: All Environment Components Registered

MCPCALL --tool ecs_list_components 2>/dev/null

Assert these components exist with correct schemas:

Suite 4: Scene Hierarchy

Test 4.1: Dome Mesh in Scene

MCPCALL --tool scene_get_hierarchy --args '{"maxDepth":2}' 2>/dev/null

The gradient dome mesh is added directly to the scene (not under LevelRoot). Look for an unnamed mesh node at the scene root level.

Suite 5: ECS Data Modification

Test 5.1: Modify DomeGradient Sky Color

MCPCALL --tool ecs_set_component --args '{"entityIndex":<root>,"componentId":"DomeGradient","field":"sky","value":"[1.0, 0.0, 0.0, 1.0]"}' 2>/dev/null

Then verify:

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

Assert: sky = [1.0, 0.0, 0.0, 1.0]

Test 5.2: Modify IBLGradient Intensity

MCPCALL --tool ecs_set_component --args '{"entityIndex":<root>,"componentId":"IBLGradient","field":"intensity","value":"2.0"}' 2>/dev/null

MCPCALL --tool ecs_set_component --args '{"entityIndex":<root>,"componentId":"IBLGradient","field":"_needsUpdate","value":true}' 2>/dev/null

Assert: ECS value updates.

Suite 6: Stability

MCPCALL --tool browser_get_console_logs --args '{"count":30,"level":["error","warn"]}' 2>/dev/null

Assert: No application-level errors or warnings. 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/poke && npx iwsdk dev down

Output a summary table:

| Suite                    | Result    |
|--------------------------|-----------|
| 1. Default Lighting      | PASS/FAIL |
| 2. System Registration   | PASS/FAIL |
| 3. Component Registration| PASS/FAIL |
| 4. Scene Hierarchy       | PASS/FAIL |
| 5. ECS Data Modification | 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/poke && 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

Live gradient color changes don't update visuals

Setting DomeGradient/IBLGradient color fields via ecs_set_component updates the ECS data but does NOT update the Three.js shader uniforms. Testing is limited to data verification.

_needsUpdate consumed immediately

The _needsUpdate flag is consumed by the EnvironmentSystem and reset to false. The response may already show newValue: false.

Default lighting auto-attach

LevelSystem attaches DomeGradient + IBLGradient to the LevelRoot ONLY if defaultLighting: true (default) AND the level root doesn't already have dome/IBL components.

Entity indices change on reload

Never cache entity indices across page reloads. Always re-discover via ecs_find_entities.

Boolean values must be JSON booleans

When setting boolean fields (like _needsUpdate) via ecs_set_component, the value must be a JSON boolean (true), not a string ("true"). Strings silently fail.