# Test Locomotion > Test locomotion system (slide, snap turn, teleport, jump) against the locomotion example using the iwsdk CLI. - Skill: `facebook/test-locomotion` (Agent Skill) - Install (CLI): `npx skillmds@latest add facebook/test-locomotion` - Raw SKILL.md: https://api.skillmd.com/api/skills/facebook/test-locomotion/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Docs & Writing - Author: facebook (https://skillmd.com/u/facebook) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/facebook/test-locomotion --- # Locomotion System Test Run 6 test suites covering slide movement, snap turn, teleport, jump, system registration, and stability. **Configuration:** - EXAMPLE_DIR: `$IWSDK_REPO_ROOT/examples/locomotion` **Tool calls**: every tool call is `npx iwsdk [--input-json ''] [--timeout ]`, run from inside the example workspace (cwd `$EXAMPLE_DIR`). The CLI auto-discovers the IWSDK app root from cwd, so no path tricks are required. Run `npx iwsdk mcp inspect` from the example to discover available tools and their CLI subcommands. - `` 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. --- ## Step 1: Install Dependencies ```bash cd $IWSDK_REPO_ROOT/examples/locomotion && 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: ```bash cd $IWSDK_REPO_ROOT/examples/locomotion && 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; 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 ```bash npx iwsdk 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 browser reload --timeout 20000 2>/dev/null` Then: `sleep 3` 2. `npx iwsdk xr enter --timeout 20000 2>/dev/null` Then: `sleep 2` 3. `npx iwsdk browser logs --input-json '{"count":20,"level":["error","warn"]}' 2>/dev/null` Assert: No error-level logs. ### Verify Locomotion Setup ```bash npx iwsdk ecs find --input-json '{"withComponents":["LocomotionEnvironment"]}' 2>/dev/null ``` Assert: At least 1 entity. Save as ``. ```bash npx iwsdk ecs query --input-json '{"entityIndex":,"components":["LocomotionEnvironment"]}' 2>/dev/null ``` Assert: `_initialized` = true, `_envHandle` > 0. ```bash npx iwsdk ecs systems 2>/dev/null ``` Assert: - LocomotionSystem (priority -5) - TurnSystem (priority 0) - SlideSystem (priority 0) - TeleportSystem (priority 0) --- ### Input Mapping Reference | Action | Controller | Input | Tool | | ----------------- | ---------- | ------------------------ | --------------------------------------------------------- | | Slide forward | Left | Thumbstick Y = -1 | `npx iwsdk xr set-gamepad-state` axes `[{0, 0}, {1, -1}]` | | Slide backward | Left | Thumbstick Y = 1 | `npx iwsdk xr set-gamepad-state` axes `[{0, 0}, {1, 1}]` | | Snap turn right | Right | Thumbstick X = 1 (edge) | `npx iwsdk xr set-gamepad-state` axes `[{0, 1}, {1, 0}]` | | Snap turn left | Right | Thumbstick X = -1 (edge) | `npx iwsdk xr set-gamepad-state` axes `[{0, -1}, {1, 0}]` | | Teleport activate | Right | Thumbstick Y = 1 (down) | `npx iwsdk xr set-gamepad-state` axes `[{0, 0}, {1, 1}]` | | Jump | Right | A button (index 3) | `npx iwsdk xr set-gamepad-state` buttons `[{3, 1, true}]` | --- ### Suite 1: Slide Movement (Left Thumbstick) **Test 1.1: Slide Forward** ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Save as "before slide". ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-left","axes":[{"index":0,"value":0},{"index":1,"value":-1}]}' 2>/dev/null ``` Then: `sleep 1` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Save as "after slide". Assert: Screenshots show scene moving closer (player moved forward). **Test 1.2: Stop Sliding** ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-left","axes":[{"index":0,"value":0},{"index":1,"value":0}]}' 2>/dev/null ``` Assert: Player stops moving (subsequent screenshots are identical). **Test 1.3: Slide Backward** ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-left","axes":[{"index":0,"value":0},{"index":1,"value":1}]}' 2>/dev/null ``` Then: `sleep 1` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Assert: Scene moves away (player retreated). Release: ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-left","axes":[{"index":0,"value":0},{"index":1,"value":0}]}' 2>/dev/null ``` --- ### Suite 2: Snap Turn (Right Thumbstick Left/Right) **Test 2.1: Snap Turn Right** ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Save as "before turn". ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":1},{"index":1,"value":0}]}' 2>/dev/null ``` Then: `sleep 0.3` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Save as "after turn right". Assert: View rotated ~45 degrees clockwise. **Test 2.2: Release + Snap Turn Left** **IMPORTANT**: Must release first for edge trigger reset. ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":0},{"index":1,"value":0}]}' 2>/dev/null ``` Then: `sleep 0.3` Push left: ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":-1},{"index":1,"value":0}]}' 2>/dev/null ``` Then: `sleep 0.3` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Assert: View rotated ~45 degrees counter-clockwise (back to roughly original heading). Release thumbstick: ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":0},{"index":1,"value":0}]}' 2>/dev/null ``` --- ### Suite 3: Teleport (Right Thumbstick Down) **Precondition**: The right controller must NOT be pointing at any interactable entity. **Test 3.1: Setup — Point Controller at Floor** ```bash npx iwsdk xr set-transform --input-json '{"device":"controller-right","position":{"x":0.25,"y":1.5,"z":-0.3},"orientation":{"pitch":-45,"roll":0,"yaw":0}}' 2>/dev/null ``` **Test 3.2: Activate Teleport Arc** ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Save as "before teleport". ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":0},{"index":1,"value":1}]}' 2>/dev/null ``` Then: `sleep 1` **Test 3.3: Release to Teleport** ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","axes":[{"index":0,"value":0},{"index":1,"value":0}]}' 2>/dev/null ``` Then: `sleep 0.5` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` Assert: Player position changed (view is from a different location). --- ### Suite 4: Jump (A Button on Right Controller) **Test 4.1: Press A Button** ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","buttons":[{"index":3,"value":1,"touched":true}]}' 2>/dev/null ``` Then: `sleep 0.3` ```bash npx iwsdk browser screenshot --timeout 20000 2>/dev/null ``` ```bash npx iwsdk xr set-gamepad-state --input-json '{"device":"controller-right","buttons":[{"index":3,"value":0,"touched":false}]}' 2>/dev/null ``` Assert: View may show momentary elevation change. --- ### Suite 5: System Registration & Config ```bash npx iwsdk ecs systems 2>/dev/null ``` Assert: - `LocomotionSystem` at priority -5 - `TurnSystem` at priority 0 with config keys: `turningMethod`, `turningAngle`, `turningSpeed` - `SlideSystem` at priority 0 with config keys: `locomotor`, `inputProvider`, `maxSpeed`, `comfortAssist`, `enableJumping` - `TeleportSystem` at priority 0 with config keys: `rayGravity`, `locomotor`, `inputProvider` Verify `Elevator` component and `ElevatorSystem`: ```bash npx iwsdk ecs find --input-json '{"withComponents":["Elevator"]}' 2>/dev/null ``` Assert: At least 1 entity (the oscillating platform). --- ### Suite 6: Stability ```bash npx iwsdk browser logs --input-json '{"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: ```bash cd $IWSDK_REPO_ROOT/examples/locomotion && npx iwsdk dev down ``` Output a summary table: ``` | Suite | Result | |---------------------------|-----------| | 1. Slide Movement | PASS/FAIL | | 2. Snap Turn | PASS/FAIL | | 3. Teleport | PASS/FAIL | | 4. Jump | PASS/FAIL | | 5. System Registration | 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/locomotion && 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 ### Locomotion moves XR origin, not headset Headset position stays constant (relative to XR origin). Verify movement via screenshots. ### Teleport blocked by interactable hover Position controller away from interactables before testing teleport. ### Snap turn is edge-triggered Must reset to center between turns. Holding the stick only fires one turn. ### Thumbstick Y axis convention Y = -1 is forward, Y = 1 is backward. For teleport, Y = 1 activates the arc. ### Entity indices change on reload Never cache entity indices across page reloads. Always re-discover via `npx iwsdk ecs find`.