# Electron UI Testing (Chrome DevTools Protocol)

The Electron Amicus window runs with remote debugging enabled via the Chrome DevTools Protocol. This allows programmatic inspection and testing of the UI state.

## Prerequisites

### Debug Port Configuration

The default debug port is 9222, but **Chrome browser also uses port 9222**. If Chrome is running, Electron will silently fail to bind. Use `AMICUS_DEBUG_PORT` to set a different port:

```bash
# Use port 9223 to avoid conflicts with Chrome
AMICUS_DEBUG_PORT=9223 amicus start --model gemini --prompt "test"
```

Verify it's accessible:

```bash
# Use the same port you configured (default: 9222, recommended: 9223)
curl -s http://127.0.0.1:9223/json | python3 -m json.tool
```

### Known Limitations

- **`contextBridge` does not work with `data:` URLs** — The toolbar is loaded via a `data:` URL in the main window. Electron's `contextBridge.exposeInMainWorld()` silently fails for `data:` origins, so `window.sidecar` is `undefined` in the toolbar. Any toolbar↔main-process communication must use `executeJavaScript()` polling instead of IPC.
- **Two debug targets per session** — The Electron window creates two pages: the OpenCode content (BrowserView at `http://localhost:<port>`) and the toolbar (`data:text/html`). Filter by URL to target the right one.

## Testing UI State with Node.js

Use the WebSocket API to execute JavaScript in the Electron renderer and inspect UI state:

```javascript
// test-electron-ui.js
const WebSocket = require('ws');

const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/<PAGE_ID>');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: `
        (function() {
          const messages = document.querySelectorAll('.message');
          const toolCalls = document.querySelectorAll('.tool-call');
          return {
            sessionId: window.sessionId,
            messagesCount: messages.length,
            toolCallsCount: toolCalls.length,
            messages: Array.from(messages).map(m => ({
              class: m.className,
              text: m.textContent.slice(0, 200)
            }))
          };
        })()
      `,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const response = JSON.parse(data);
  if (response.id === 1) {
    console.log(JSON.stringify(response.result?.result?.value, null, 2));
    ws.close();
  }
});
```

## Common UI Test Queries

**Get page ID first:**
```bash
curl -s http://127.0.0.1:9223/json | python3 -c "import sys,json; print(json.load(sys.stdin)[0]['id'])"
```

**Check UI state (inline):**
```bash
node << 'EOF'
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/<PAGE_ID>');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: `({
        hasConfig: !!window.sidecarConfig,
        model: window.sidecarConfig?.model,
        messagesCount: document.querySelectorAll('.message').length,
        toolCallsCount: document.querySelectorAll('.tool-call').length,
        errorMessages: Array.from(document.querySelectorAll('.error-message')).map(e => e.textContent)
      })`,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const r = JSON.parse(data);
  if (r.id === 1) { console.log(JSON.stringify(r.result?.result?.value, null, 2)); ws.close(); }
});

setTimeout(() => { ws.close(); process.exit(0); }, 5000);
EOF
```

**Get tool call details:**
```bash
node << 'EOF'
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/<PAGE_ID>');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: `
        Array.from(document.querySelectorAll('.tool-call')).map(t => ({
          class: t.className,
          html: t.innerHTML.slice(0, 500)
        }))
      `,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const r = JSON.parse(data);
  if (r.id === 1) { console.log(JSON.stringify(r.result?.result?.value, null, 2)); ws.close(); }
});

setTimeout(() => { ws.close(); process.exit(0); }, 5000);
EOF
```

## Expected UI Elements

When testing the Amicus UI, verify these elements:

| Selector | Description | Expected Content |
|----------|-------------|------------------|
| `.message.system` | Task briefing | "Task: {briefing}" |
| `.message.assistant` | Model response | Response text |
| `.message.user` | User input | User's message |
| `.tool-call` | Tool execution | Tool name, input, output |
| `.tool-call.completed` | Completed tool | Has ✓ status |
| `.tool-call.running` | Running tool | Has ... status |
| `.tool-status-panel` | Tool summary | "Tools: X/Y completed" |
| `.reasoning` | Model reasoning | Collapsible thinking |
| `.error-message` | Error display | Error text |

## Debugging Tips

1. **Get WebSocket URL**: `curl -s http://127.0.0.1:9223/json | jq '.[0].webSocketDebuggerUrl'`
2. **Enable console capture**: Send `{"method": "Console.enable"}` first
3. **Screenshot**: Use `Page.captureScreenshot` method
4. **Timeout**: Always add a timeout to prevent hanging scripts

## Quick WebSocket Testing Patterns

The WebSocket approach via Chrome DevTools Protocol is the most efficient way to test the Amicus UI programmatically. Here are streamlined patterns for common testing scenarios:

**1. Get Page ID and Check UI State (one-liner):**
```bash
PAGE_ID=$(curl -s http://127.0.0.1:9223/json | node -e "const d=require('fs').readFileSync(0,'utf8');const p=JSON.parse(d);console.log(p[0]?.id || 'NO_ID')")
echo "Page ID: $PAGE_ID"
```

**2. Inspect UI State:**
```bash
node -e "
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/$PAGE_ID');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: \`
        (function() {
          const messages = document.querySelectorAll('.message');
          return {
            sseSubscribed: typeof sseSubscribed !== 'undefined' ? sseSubscribed : false,
            messagesCount: messages.length,
            messages: Array.from(messages).map(m => ({
              class: m.className,
              text: (m.textContent || '').slice(0, 200)
            }))
          };
        })()
      \`,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  if (msg.id === 1) {
    console.log(JSON.stringify(msg.result?.result?.value, null, 2));
    ws.close();
    process.exit(0);
  }
});

setTimeout(() => { ws.close(); process.exit(0); }, 3000);
"
```

**3. Send a Message via UI:**
```bash
node -e "
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/$PAGE_ID');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: \`
        (function() {
          const input = document.getElementById('message-input');
          input.value = 'What is 2+2? Just give me the number.';
          input.dispatchEvent(new Event('input'));
          document.getElementById('send-btn').click();
          return 'Message sent';
        })()
      \`,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  if (msg.id === 1) {
    console.log(msg.result?.result?.value);
    ws.close();
    process.exit(0);
  }
});

setTimeout(() => { ws.close(); process.exit(0); }, 3000);
"
```

**4. Check for Errors:**
```bash
node -e "
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/$PAGE_ID');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: \`({
        lastError: document.querySelector('.error-message')?.textContent,
        sessionId: typeof sessionId !== 'undefined' ? sessionId : 'undefined',
        isWaiting: typeof isWaitingForResponse !== 'undefined' ? isWaitingForResponse : 'undefined'
      })\`,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  if (msg.id === 1) {
    console.log(JSON.stringify(msg.result?.result?.value, null, 2));
    ws.close();
    process.exit(0);
  }
});

setTimeout(() => { ws.close(); process.exit(0); }, 3000);
"
```

**Why WebSocket Testing is Efficient:**
- **No file creation**: Tests run inline without creating temporary files
- **Direct DOM access**: Query and manipulate any UI element
- **Real-time state**: Access JavaScript variables like `sessionId`, `sseSubscribed`, `isWaitingForResponse`
- **Click simulation**: Trigger button clicks and input events programmatically
- **Fast iteration**: Quickly test changes without restarting the app

**Important Notes:**
- Run commands from the amicus directory to access the `ws` module
- Page ID changes on each Electron launch - always fetch dynamically
- Add timeouts to prevent hanging on WebSocket errors
- Use `data.toString()` when parsing WebSocket messages in newer Node.js versions

## Integration with CI

For automated testing, launch Amicus with a known task and verify UI state:

```bash
# Launch Amicus in background
node bin/amicus.js start --model "openrouter/google/gemini-2.5-pro" \
  --briefing "Echo hello" &
AMICUS_PID=$!

# Wait for window to open
sleep 5

# Get page ID and test UI
PAGE_ID=$(curl -s http://127.0.0.1:9223/json | python3 -c "import sys,json; print(json.load(sys.stdin)[0]['id'])")

# Run UI verification script
node scripts/verify-ui-state.js "$PAGE_ID"

# Cleanup
kill $AMICUS_PID
```

## Visual UI Testing with Screenshots

### macOS (native tools)

**Launch and position Electron window:**
```bash
# Start Amicus in background
node bin/amicus.js start --model "openrouter/google/gemini-3-flash-preview" --briefing "Test task" &
sleep 8

# Bring window to front and position it (window may open off-screen)
# Note: osascript / AppleScript is macOS-only
osascript << 'EOF'
tell application "System Events"
    tell process "Electron"
        set frontmost to true
        set position of window 1 to {100, 100}
    end tell
end tell
EOF
```

**Take screenshot (macOS — `screencapture` is macOS-only):**
```bash
screencapture -x /tmp/amicus-screenshot.png
```

### Windows (CDP-based, cross-platform)

`screencapture` and AppleScript are not available on Windows. Use CDP `Page.captureScreenshot` instead (works on all platforms):

```javascript
const { CdpClient } = require('./tests/helpers/cdp-client');
const cdp = await CdpClient.toolbar(9223);
await cdp.screenshot('C:\\tmp\\amicus-screenshot.png');
cdp.close();
```

To verify window visibility on Windows without a screenshot:
```powershell
Get-Process electron | Select-Object MainWindowTitle, MainWindowHandle
```

**Dynamic page ID retrieval (required - ID changes each session):**
```bash
PAGE_ID=$(curl -s http://127.0.0.1:9223/json | node -e "const d=require('fs').readFileSync(0,'utf8');console.log(JSON.parse(d)[0].id)")
```

**Click UI elements and inspect state (run from amicus directory for `ws` module):**
```bash
cd /path/to/amicus
cat << EOF > test-ui.js
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/${PAGE_ID}');

ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: \`
        (function() {
          // Click model selector
          document.getElementById('model-selector-display')?.click();

          // Or force dropdown visible
          document.getElementById('model-selector-dropdown')?.classList.add('visible');

          // Return state
          return Array.from(document.querySelectorAll('.model-option'))
            .map(opt => ({
              name: opt.querySelector('.model-name-display')?.textContent,
              selected: opt.classList.contains('selected')
            }));
        })()
      \`,
      returnByValue: true
    }
  }));
});

ws.on('message', (data) => {
  const msg = JSON.parse(data);
  if (msg.id === 1) {
    console.log(JSON.stringify(msg.result?.result?.value, null, 2));
    ws.close();
    process.exit(0);
  }
});

setTimeout(() => { ws.close(); process.exit(0); }, 3000);
EOF
node test-ui.js
```

**Common gotchas:**
- Window may open off-screen (negative Y coordinate) - use AppleScript to reposition
- Page ID changes on each Electron launch - always fetch dynamically
- Run Node.js scripts from amicus directory to access `ws` module
- Add `setTimeout` to prevent hanging on WebSocket errors
- **Always use `AMICUS_DEBUG_PORT=9223`** when Chrome is running (Chrome claims 9222)

## Toolbar-Specific Testing

The toolbar is a `data:text/html` page — a separate debug target from the OpenCode content view.

**Find the toolbar page ID:**
```bash
TOOLBAR_ID=$(curl -s http://127.0.0.1:9223/json | node -e "
const d=require('fs').readFileSync(0,'utf8');
const pages=JSON.parse(d);
const toolbar = pages.find(p => p.url && p.url.startsWith('data:'));
console.log(toolbar ? toolbar.id : 'NOT_FOUND');
")
echo "Toolbar ID: $TOOLBAR_ID"
```

**Inspect toolbar state (update banner, buttons, timer):**
```bash
cd /path/to/amicus
node -e "
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:9223/devtools/page/$TOOLBAR_ID');
ws.on('open', () => {
  ws.send(JSON.stringify({
    id: 1,
    method: 'Runtime.evaluate',
    params: {
      expression: \`({
        bannerVisible: document.getElementById('update-banner')?.style?.display === 'flex',
        bannerText: document.getElementById('update-text')?.textContent,
        timerText: document.getElementById('timer')?.textContent,
        foldBtnText: document.getElementById('fold-btn')?.textContent
      })\`,
      returnByValue: true
    }
  }));
});
ws.on('message', (data) => {
  const msg = JSON.parse(data.toString());
  if (msg.id === 1) { console.log(JSON.stringify(msg.result?.result?.value, null, 2)); ws.close(); process.exit(0); }
});
setTimeout(() => { ws.close(); process.exit(0); }, 3000);
"
```

**Note:** `window.sidecar` is `undefined` in the toolbar (see Known Limitations above). The toolbar communicates with the main process via `window.__amicusUpdateAction` polling, not IPC.