Flutter Windows Desktop UI Testing via Win32 API

Overview

Flutter desktop apps on Windows render everything inside a single FLUTTERVIEW pane — the Windows UI Automation accessibility tree only exposes this single element. Therefore, coordinate-based automation via user32.dll is the practical approach.

Architecture

PowerShell Script
    ├── Add-Type (C# interop for user32.dll)
    ├── Process → MainWindowHandle (HWND)
    ├── Focus: AttachThreadInput + BringWindowToTop + SetForegroundWindow
    ├── Coordinates: GetClientRect + ClientToScreen (excludes title bar)
    ├── Click: SetCursorPos + mouse_event
    ├── Key: keybd_event
    └── Screenshot: System.Drawing.Graphics.CopyFromScreen