Play Test GridRacer

Launch the game and test it visually using Automation MCP with numpad keyboard input.

Prerequisites

• Build must succeed first
• Automation MCP needs Accessibility + Screen Recording permissions

Numpad Control Mapping

The game uses numpad keys (1-9) to select acceleration:

 7  8  9     ↖  ↑  ↗     (-1,+1) (0,+1) (+1,+1)
 4  5  6  =  ←  ·  →  =  (-1, 0) (0, 0) (+1, 0)
 1  2  3     ↙  ↓  ↘     (-1,-1) (0,-1) (+1,-1)

• 5 = coast (no acceleration, maintain velocity)
• 6 = accelerate right
• 4 = accelerate left
• 8 = accelerate up
• 2 = accelerate down
• Corners (1,3,7,9) = diagonal acceleration
• r = reset game

Steps

1. Build and Install

xcodebuild -scheme GridRacer -configuration Debug -destination 'generic/platform=iOS Simulator' build 2>&1 | grep -E "(error:|BUILD|FAILED|SUCCEEDED)" | tail -10
APP_PATH=$(find ~/Library/Developer/Xcode/DerivedData -name "GridRacer.app" -path "*/Build/Products/Debug-iphonesimulator/*" -not -path "*Index.noindex*" -type d 2>/dev/null | head -1)

2. Boot and Launch

SIMULATOR=$(xcrun simctl list devices available | grep -E "iPhone (16|15|14)" | head -1 | sed -E 's/.*iPhone ([0-9]+).*/iPhone \1/')
xcrun simctl boot "$SIMULATOR" 2>/dev/null || true
xcrun simctl install booted "$APP_PATH"
xcrun simctl launch booted trouarat.GridRacer

3. Send Keyboard Input via AppleScript

IMPORTANT: The iOS Simulator requires AppleScript to receive keyboard input. Use this bash command pattern:

# Send a single key to the Simulator
osascript -e 'tell application "Simulator" to activate' && sleep 0.3 && osascript -e 'tell application "System Events" to keystroke "KEY"'

Replace KEY with the desired key (1-9 for moves, r for reset).

4. Play Test Loop

For each turn:

1. Screenshot the game state via mcp__automation__screenshot(mode: "window", windowName: "iPhone 16 Pro")
2. Analyze: Look at HUD for current player, velocity, and position
3. Observe markers: Green=safe, red=crash
4. Send numpad key via AppleScript bash command
5. Wait for animation: mcp__automation__sleep(ms: 700)
6. Screenshot result and verify:
   • Position changed correctly
   • Velocity updated (old + acceleration)
   • Crash detection works (life lost, respawn)
   • Lap counting works (finish line crossing)

5. Reset Game (if needed)

osascript -e 'tell application "Simulator" to activate' && sleep 0.3 && osascript -e 'tell application "System Events" to keystroke "r"'

6. Close App

xcrun simctl terminate booted trouarat.GridRacer

Example Play Test Sequence

# Screenshot initial state
mcp__automation__screenshot(mode: "window", windowName: "iPhone 16 Pro")

# Player 1: accelerate right (key 6)
osascript -e 'tell application "Simulator" to activate' && sleep 0.3 && osascript -e 'tell application "System Events" to keystroke "6"'
mcp__automation__sleep(ms: 700)
mcp__automation__screenshot(...)

# Player 2: accelerate right (key 6)
osascript -e 'tell application "Simulator" to activate' && sleep 0.3 && osascript -e 'tell application "System Events" to keystroke "6"'
mcp__automation__sleep(ms: 700)
mcp__automation__screenshot(...)

# Continue alternating...

Test Scenarios

Basic Movement

1. Screenshot initial state (both players at start, vel=(0,0))
2. P1: Press 6 (accelerate right) → vel should become (1,0)
3. P2: Press 6 → P2 vel should become (1,0)
4. P1: Press 5 (coast) → P1 should move by current velocity

Velocity Accumulation

1. P1: Press 6 three times (interspersed with P2 turns)
2. P1's velocity should grow: (1,0) → (2,0) → (3,0)

Collision Test

1. Steer a player toward the wall (red markers)
2. Press numpad key for crash trajectory
3. Verify: life lost, respawn, velocity reset to (0,0)

Lap Completion

1. Navigate around track crossing finish line
2. Verify lap counter increments