Tauri MCP Testing

Tauri MCP E2E Testing

CRITICAL: For E2E testing of Tauri applications, ALWAYS use tauri_* MCP tools. NEVER use Chrome DevTools MCP - that's for browser pages only.

Quick Reference

Prerequisites

1. MCP Bridge Plugin installed in the Tauri app
2. App running in development mode (pnpm tauri:dev)
3. Port 9323 accessible for VMark automation. VMark pins the debug-only Tauri MCP bridge to 127.0.0.1:9323; port 9223 is VMark's own auth-protected MCP server and is not valid for E2E automation.

If connection fails, run tauri_get_setup_instructions to get plugin installation guide.

Core Workflow

1. START SESSION    → Connect to running Tauri app
2. VERIFY STATE     → Screenshot + find elements
3. INTERACT         → Click, type, scroll
4. WAIT             → Wait for expected results
5. VERIFY           → Check IPC, logs, DOM state
6. CLEANUP          → Stop session when done

Session Management

Start Session

// Connect to VMark's automation bridge
tauri_driver_session({ action: 'start', port: 9323 })

// Connect to specific port
tauri_driver_session({ action: 'start', port: 9324 })

// Connect to remote host (mobile testing)
tauri_driver_session({ action: 'start', host: '<device-ip>', port: 9323 })

Check Status

tauri_driver_session({ action: 'status' })
// Returns: connected apps, default app, identifiers

Stop Session

// Stop all sessions
tauri_driver_session({ action: 'stop' })

// Stop specific app
tauri_driver_session({ action: 'stop', appIdentifier: 9323 })

Testing Patterns

Pattern 1: Visual Verification

// 1. Take screenshot to see current state
tauri_webview_screenshot()

// 2. Take screenshot of specific element
tauri_webview_screenshot({ uid: 'editor-content' })

// 3. Save to file for comparison
tauri_webview_screenshot({ filePath: 'dev-docs/archive/test-screenshots/test-screenshot.png' })

Pattern 2: Element Interaction

// 1. Find element first
tauri_webview_find_element({ selector: '.save-button' })

// 2. Click element
tauri_webview_interact({ action: 'click', selector: '.save-button' })

// 3. Double-click
tauri_webview_interact({ action: 'double-click', selector: '.editor' })

// 4. Long-press (touch simulation)
tauri_webview_interact({ action: 'long-press', selector: '.item', duration: 500 })

// 5. Scroll
tauri_webview_interact({ action: 'scroll', selector: '.content', scrollY: 500 })

// 6. Swipe
tauri_webview_interact({
  action: 'swipe',
  fromX: 300, fromY: 400,
  toX: 100, toY: 400,
  duration: 300
})

Pattern 3: Keyboard Input

// Type into focused element
tauri_webview_keyboard({
  action: 'type',
  selector: '.editor-input',
  text: '# Hello World'
})

// Press key
tauri_webview_keyboard({ action: 'press', key: 'Enter' })

// Key with modifiers
tauri_webview_keyboard({
  action: 'press',
  key: 's',
  modifiers: ['Control']  // Ctrl+S
})

// Key combinations
tauri_webview_keyboard({
  action: 'press',
  key: 'z',
  modifiers: ['Meta', 'Shift']  // Cmd+Shift+Z (redo on macOS)
})

Pattern 4: Wait for State

// Wait for element to appear
tauri_webview_wait_for({
  type: 'selector',
  value: '.success-toast',
  timeout: 5000
})

// Wait for text to appear
tauri_webview_wait_for({
  type: 'text',
  value: 'File saved successfully',
  timeout: 3000
})

// Wait for IPC event
tauri_webview_wait_for({
  type: 'ipc-event',
  value: 'file-saved',
  timeout: 5000
})

Pattern 5: IPC Testing

// Start monitoring IPC calls
tauri_ipc_monitor({ action: 'start' })

// Perform action that triggers IPC
tauri_webview_interact({ action: 'click', selector: '.save-button' })

// Get captured IPC calls
tauri_ipc_get_captured({ filter: 'save_file' })

// Execute IPC command directly
tauri_ipc_execute_command({
  command: 'get_document_state',
  args: { id: 'doc-123' }
})

// Emit event to test handlers
tauri_ipc_emit_event({
  eventName: 'file-changed',
  payload: { path: '/test/file.md' }
})

// Stop monitoring
tauri_ipc_monitor({ action: 'stop' })

Pattern 6: JavaScript Execution

// Get value from DOM (MUST use IIFE for return values)
tauri_webview_execute_js({
  script: '(() => { return document.querySelector(".editor").textContent; })()'
})

// Check Tauri API available
tauri_webview_execute_js({
  script: '(() => { return typeof window.__TAURI__ !== "undefined"; })()'
})

// Get computed style
tauri_webview_execute_js({
  script: '(() => { return getComputedStyle(document.body).backgroundColor; })()'
})

// Trigger custom event
tauri_webview_execute_js({
  script: 'document.dispatchEvent(new CustomEvent("test-event", { detail: { test: true } }))'
})

Debugging

Read Console Logs

// Get recent console logs
tauri_read_logs({ source: 'console', lines: 50 })

// Filter logs
tauri_read_logs({ source: 'console', filter: 'error', lines: 100 })

// Logs since specific time
tauri_read_logs({
  source: 'console',
  since: '2024-01-01T10:00:00Z',
  lines: 50
})

Platform-Specific Logs

// Desktop system logs
tauri_read_logs({ source: 'system', lines: 100 })

// Android logcat
tauri_read_logs({ source: 'android', filter: 'vmark', lines: 100 })

// iOS simulator logs
tauri_read_logs({ source: 'ios', lines: 100 })

Window Management

// List all windows
tauri_manage_window({ action: 'list' })

// Get window info
tauri_manage_window({ action: 'info', windowId: 'main' })

// Resize window for responsive testing
tauri_manage_window({ action: 'resize', width: 800, height: 600 })

// Resize specific window
tauri_manage_window({
  action: 'resize',
  windowId: 'settings',
  width: 400,
  height: 300
})

Get CSS Styles

// Get all computed styles
tauri_webview_get_styles({ selector: '.editor' })

// Get specific properties
tauri_webview_get_styles({
  selector: '.editor',
  properties: ['font-size', 'color', 'background-color']
})

// Get styles from multiple elements
tauri_webview_get_styles({
  selector: '.toolbar button',
  multiple: true,
  properties: ['opacity', 'visibility']
})

Common Test Scenarios

Scenario: File Operations

// 1. Connect
tauri_driver_session({ action: 'start', port: 9323 })

// 2. Open file dialog
tauri_webview_keyboard({ action: 'press', key: 'o', modifiers: ['Control'] })

// 3. Wait for content to load (using IPC)
tauri_ipc_monitor({ action: 'start' })
// ... file selection happens externally or via mocked dialog ...
tauri_ipc_get_captured({ filter: 'read_file' })

// 4. Verify content loaded
tauri_webview_find_element({ selector: '.editor-content' })
tauri_webview_execute_js({
  script: '(() => { return document.querySelector(".editor-content").textContent.length > 0; })()'
})

Scenario: Editor Typing

// 1. Focus editor
tauri_webview_interact({ action: 'click', selector: '.editor' })

// 2. Type content
tauri_webview_keyboard({
  action: 'type',
  selector: '.editor [contenteditable]',
  text: '# Test Document\n\nThis is a test.'
})

// 3. Verify dirty state
tauri_webview_find_element({ selector: '[data-dirty="true"]' })

// 4. Save with Ctrl+S
tauri_webview_keyboard({ action: 'press', key: 's', modifiers: ['Control'] })

// 5. Verify saved
tauri_webview_wait_for({ type: 'selector', value: '[data-dirty="false"]' })

Scenario: Responsive Testing

// Test mobile viewport
tauri_manage_window({ action: 'resize', width: 375, height: 667 })
tauri_webview_screenshot({ filePath: 'dev-docs/archive/test-screenshots/mobile.png' })
tauri_webview_find_element({ selector: '.mobile-menu-button' })

// Test tablet viewport
tauri_manage_window({ action: 'resize', width: 768, height: 1024 })
tauri_webview_screenshot({ filePath: 'dev-docs/archive/test-screenshots/tablet.png' })

// Test desktop viewport
tauri_manage_window({ action: 'resize', width: 1920, height: 1080 })
tauri_webview_screenshot({ filePath: 'dev-docs/archive/test-screenshots/desktop.png' })

Troubleshooting

Reference Files

Related Skills

• tauri-app-dev — General Tauri 2.0 patterns (commands, state, plugins, security)
• tauri-v2-integration — VMark-specific IPC patterns (invoke/emit bridges, menu accelerators)
• rust-tauri-backend — VMark Rust backend implementation