cua-driver test harness

Deterministic host apps that present a fixed scenario set for cua-driver to drive. One layout, three buckets: cross-OS reusable assets in shared/, OS-specific (or cross-platform) target apps in apps/, host-OS build scripts in build/, host-OS CLI smoke runners in smoke/.

Layout

test-harness/
├── shared/                  # cross-OS reusable
│   ├── scenarios.json       # single SoT for AutomationIds / window titles
│   └── web/index.html       # WebView2 + Electron load this same file
├── apps/                    # the test-target host apps
│   ├── cross-platform/
│   │   └── electron/        # CuaTestHarness.Electron (CDP host, runs on any OS)
│   ├── macos/
│   │   ├── appkit/          # CuaTestHarness.AppKit  (single-file Swift)
│   │   └── swiftui/         # CuaTestHarness.SwiftUI (single-file Swift)
│   └── windows/
│       ├── wpf/             # CuaTestHarness.Wpf      (.NET 8 WPF)
│       ├── winui3/          # CuaTestHarness.WinUI3   (.NET 8 WinUI3 unpackaged)
│       └── webview2/        # CuaTestHarness.WebView  (WPF + Microsoft.Edge.WebView2)
├── build/                   # host-OS build scripts (publish into ../rust/test-apps/)
│   ├── macos.sh             # builds appkit + swiftui
│   └── windows.ps1          # builds wpf + winui3 + webview2 + electron
└── smoke/                   # host-OS per-tool CLI smoke runners
    ├── macos.sh             # spawns appkit harness, iterates every tool
    └── results/macos.txt    # checked-in baseline for diff-based regression detection

shared/scenarios.json is the single source of truth — both the host apps and the Rust integration tests read it so AutomationIds, AX identifiers, and window titles never drift between the two halves.

Published build outputs land in ../rust/test-apps/harness-{wpf,winui3,webview,electron,appkit,swiftui}/ so the existing sandbox runner and Rust integration tests pick them up without further wiring.

What's exercised

WPF (apps/windows/wpf):

• Plain XAML controls + AutomationIds (counter, text_body)
• TextBox + mirrored label (text_input)
• Right/double-click target (click_target)
• Scroll body with VerticalOffset label + WM_VSCROLL hook (scroll_target)
• Modal MessageBox (message_box)
• Save/Cancel bottom strip — regression guard for PR #1696 (bottom_strip)
• Native Win32 child HWNDs via HwndHost (child_hwnd)
• Owned secondary Window (owned_popup)
• Layered transparent window (layered_popup)
• Keyboard accelerators — F5 + Ctrl+Shift+H (accelerator)

WinUI3 (apps/windows/winui3):

• counter / text_body / exit (parity with WPF)
• TextBox + mirror (text_input — UIA ValuePattern)
• CommandBarFlyout — popup in same HWND, DComp-rendered
• XAML Popup — primitive, not a separate HWND

WebView2 (apps/windows/webview2):

• Loads shared/web/index.html — same page as the Electron harness.
• Exposes CDP on default_cdp_port=9222 so cua-driver's page tool can drive it.

Electron (apps/cross-platform/electron):

• Loads the same shared/web/index.html. CDP on default_cdp_port=9223.

AppKit (apps/macos/appkit):

• Plain NSButton + NSTextField counter (counter)
• NSTextField label with shared marker (text_body)
• Editable NSTextField + mirror label (text_input)
• Custom NSView click-target (click_target)
• NSScrollView with tall NSTextView body + offset label (scroll_target)
• Top NSMenu item with known title (ns_menubar)
• Exit button

SwiftUI (apps/macos/swiftui):

• Counter / text_body / text_input parity with AppKit
• SwiftUI .popover() — Mac analogue of WinUI3 CommandBarFlyout / XAML Popup
• Exit button

Coverage matrices (Rust integration tests)

Windows:

macOS:

Build

macOS (requires Xcode CLT for xcrun swiftc):

libs/cua-driver/test-harness/build/macos.sh                # both apps
libs/cua-driver/test-harness/build/macos.sh --skip swiftui # AppKit only
libs/cua-driver/test-harness/build/macos.sh --clean        # nuke stage dirs first

Windows (requires .NET 8 SDK on PATH; Node.js + npm for the Electron app):

cd libs\cua-driver\test-harness
.\build\windows.ps1                  # all four apps
.\build\windows.ps1 -Skip winui3     # skip a specific one

Run the integration tests

# macOS
cd libs/cua-driver/rust
cargo test --release --test harness_appkit_test    -- --ignored --nocapture
cargo test --release --test harness_swiftui_test   -- --ignored --nocapture

# Windows (locally)
cd libs\cua-driver\rust
cargo test --test harness_wpf_test     -- --ignored --nocapture
cargo test --test harness_winui3_test  -- --ignored --nocapture

# Windows Sandbox (matches CI)
.\rust\sandbox\run-tests-in-sandbox.ps1 harness_wpf
.\rust\sandbox\run-tests-in-sandbox.ps1 harness_winui3

Tests are #[ignore] so they don't run in plain cargo test (they require the harness apps to be built and, on macOS, TCC Accessibility granted to the test runner).

Per-tool CLI smoke

Companion to the MCP integration tests. Spawns the AppKit harness as a victim, then iterates every cua-driver tool with sensible JSON args and reports PASS / FAIL / SKIP in a sorted table. Runs in ~25 seconds.

libs/cua-driver/test-harness/smoke/macos.sh

A baseline result file (smoke/results/macos.txt) is checked in for the current driver version — diff against it to catch regressions in tool coverage.

AppKit / SwiftUI AX quirks captured in the tests

• accessibilityIdentifier on AXStaticText doesn't propagate. NSTextField label-mode + SwiftUI Text views render as AXStaticText leaves and the OS drops the identifier slot. Tests assert AX-id only on actionable controls and assert on text-content for labels.
• SwiftUI popovers may live in a separate AXWindow. The popover test walks list_windows for any new window owned by the harness pid if the trigger window doesn't contain the marker.
• AX element budget caps tree depth + width. The scroll-body is capped at 30 lines so later scenarios don't get truncated.