Re-introduce Desktop integration tests#16017
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JunielKatarn merged 62 commits intomicrosoft:mainfrom Apr 22, 2026
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Performance Test ResultsBranch: ✅ Passed161 scenario(s) across 28 suite(s) — no regressionsSectionList
FlatList
TouchableOpacity
ScrollView
TouchableHighlight
Pressable
Modal
Image
ActivityIndicator
Switch
Button
TextInput
View
Text
SectionList.native-perf-test.ts
FlatList.native-perf-test.ts
TouchableHighlight.native-perf-test.ts
TouchableOpacity.native-perf-test.ts
Pressable.native-perf-test.ts
ScrollView.native-perf-test.ts
ActivityIndicator.native-perf-test.ts
TextInput.native-perf-test.ts
Switch.native-perf-test.ts
Button.native-perf-test.ts
Modal.native-perf-test.ts
Image.native-perf-test.ts
View.native-perf-test.ts
Text.native-perf-test.ts
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Leverages the Desktop DLL activation factories removing the need to declare some types in the DLL DEF list which are only required for testing and otherwise should stay module-private.
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* Update packages locks * Update node locks * Add FollyWin32 lock * Add Prototype * Try adding IDLs from MSRN * Update Vars target * Add manifest, just in case * Export property bag symbols used by desk ITs * Grab missing generated includes * Instantiate msrn:ReactNativeHost * TODO: Obtain main queue * Implement TestUIDispatcher * Define HermesPackageName MSBuild property * split instance settins instantiation * Set up bundle source and platform * Init apartment at class init * Declare TestReactNativeHostHolder * Update lock * Add WinAppSDK dependency * Bootstrap WinApp runtime * Implement holder synchronization and UI queue * Update TestUIDispatcher to user DispatcherQueue * Update yarn lock * CallJSFunction: runApplication * CallJSFunction: unmountApplicationComponentAtRootTag * Add TestModule.h * Fix REACT_METHOD declarations * Implement sendAppEvent * Implement awaiting logic for TestModule * Add plumbing to make Dummy test pass * Add AppState mock * Place test support types into own compilation units and headers * Place test support types into own compilation units and headers * Rename MockCompositionContext -> TestCompositionContext * Set namespace * Rename Prototype.cpp to RNTesterHeadlessTests.cpp * Minor edit * Remove unused activation code The test DLL is loaded by testhost.exe, which knows nothing about the DLL's WinRT classes. The DLL has an embedded manifest (resource ID 2) that registers activatable WinRT classes (like ReactNativeHost). The code called CreateActCtxW to load that manifest and ActivateActCtx to push it onto the thread's activation context stack — so that RoGetActivationFactory could resolve those WinRT types at runtime. * Use infinite wait for events. Time limits will be enforceb by CI tasks. * Add failing condition to DummyTest * Add class diagram * Change files * Remove PR.md * Remove manifest * Remove comment * Implement WinRTActivationShims Leverages the Desktop DLL activation factories removing the need to declare some types in the DLL DEF list which are only required for testing and otherwise should stay module-private. * clang format * Remove unused test filter entries * Rename update CI references to RNTesterHeadlessTests * Put Windows.h in separate "paragraph" * Install Windows App SDK Runtime into build agents * Move checkout step before installers downloads
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* Update packages locks * Update node locks * Add FollyWin32 lock * Add Prototype * Try adding IDLs from MSRN * Update Vars target * Add manifest, just in case * Export property bag symbols used by desk ITs * Grab missing generated includes * Instantiate msrn:ReactNativeHost * TODO: Obtain main queue * Implement TestUIDispatcher * Define HermesPackageName MSBuild property * split instance settins instantiation * Set up bundle source and platform * Init apartment at class init * Declare TestReactNativeHostHolder * Update lock * Add WinAppSDK dependency * Bootstrap WinApp runtime * Implement holder synchronization and UI queue * Update TestUIDispatcher to user DispatcherQueue * Update yarn lock * CallJSFunction: runApplication * CallJSFunction: unmountApplicationComponentAtRootTag * Add TestModule.h * Fix REACT_METHOD declarations * Implement sendAppEvent * Implement awaiting logic for TestModule * Add plumbing to make Dummy test pass * Add AppState mock * Place test support types into own compilation units and headers * Place test support types into own compilation units and headers * Rename MockCompositionContext -> TestCompositionContext * Set namespace * Rename Prototype.cpp to RNTesterHeadlessTests.cpp * Minor edit * Remove unused activation code The test DLL is loaded by testhost.exe, which knows nothing about the DLL's WinRT classes. The DLL has an embedded manifest (resource ID 2) that registers activatable WinRT classes (like ReactNativeHost). The code called CreateActCtxW to load that manifest and ActivateActCtx to push it onto the thread's activation context stack — so that RoGetActivationFactory could resolve those WinRT types at runtime. * Use infinite wait for events. Time limits will be enforceb by CI tasks. * Add failing condition to DummyTest * Add class diagram * Change files * Remove PR.md * Remove manifest * Remove comment * Implement WinRTActivationShims Leverages the Desktop DLL activation factories removing the need to declare some types in the DLL DEF list which are only required for testing and otherwise should stay module-private. * clang format * Remove unused test filter entries * Rename update CI references to RNTesterHeadlessTests * Put Windows.h in separate "paragraph" * Install Windows App SDK Runtime into build agents * Move checkout step before installers downloads
JunielKatarn
added a commit
that referenced
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Apr 22, 2026
* Re-introduce Desktop integration tests (#16017) * Update packages locks * Update node locks * Add FollyWin32 lock * Add Prototype * Try adding IDLs from MSRN * Update Vars target * Add manifest, just in case * Export property bag symbols used by desk ITs * Grab missing generated includes * Instantiate msrn:ReactNativeHost * TODO: Obtain main queue * Implement TestUIDispatcher * Define HermesPackageName MSBuild property * split instance settins instantiation * Set up bundle source and platform * Init apartment at class init * Declare TestReactNativeHostHolder * Update lock * Add WinAppSDK dependency * Bootstrap WinApp runtime * Implement holder synchronization and UI queue * Update TestUIDispatcher to user DispatcherQueue * Update yarn lock * CallJSFunction: runApplication * CallJSFunction: unmountApplicationComponentAtRootTag * Add TestModule.h * Fix REACT_METHOD declarations * Implement sendAppEvent * Implement awaiting logic for TestModule * Add plumbing to make Dummy test pass * Add AppState mock * Place test support types into own compilation units and headers * Place test support types into own compilation units and headers * Rename MockCompositionContext -> TestCompositionContext * Set namespace * Rename Prototype.cpp to RNTesterHeadlessTests.cpp * Minor edit * Remove unused activation code The test DLL is loaded by testhost.exe, which knows nothing about the DLL's WinRT classes. The DLL has an embedded manifest (resource ID 2) that registers activatable WinRT classes (like ReactNativeHost). The code called CreateActCtxW to load that manifest and ActivateActCtx to push it onto the thread's activation context stack — so that RoGetActivationFactory could resolve those WinRT types at runtime. * Use infinite wait for events. Time limits will be enforceb by CI tasks. * Add failing condition to DummyTest * Add class diagram * Change files * Remove PR.md * Remove manifest * Remove comment * Implement WinRTActivationShims Leverages the Desktop DLL activation factories removing the need to declare some types in the DLL DEF list which are only required for testing and otherwise should stay module-private. * clang format * Remove unused test filter entries * Rename update CI references to RNTesterHeadlessTests * Put Windows.h in separate "paragraph" * Install Windows App SDK Runtime into build agents * Move checkout step before installers downloads * Update unbroken/bin.js UNIX mode
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Description
Introduce JavaScript-driven integration tests for the Desktop DLL (
react-native-win32.dll).They are partially based on Facebook React Native's RNTesterIntegrationTests, but are new architecture-compliant.
Type of Change
Why
#15371 Removed necessary tests for the Desktop DLL coverage, bug investigation and experimentation.
What
Added updated test infrastructure (compliant with the bridgeless architecture) for the RNTesterIntegrationTest harness.
It supports headless (non-GUI) module consumption in JavaScript delivered by React Native's Metro bundler.
Note: All GUI functionality is stubbed, which added to the size and file count in this PR.
See added type diagram:
Extra
HermesPackageNameMSBuild property. This allows using the "fat" NuGet package which includes PDBs.Invoke-WebRequestWithRetryinto a reusable script.Testing
Defined test class
RNTesterHeadlessTestsand a minimalDummyTestcase.Remaining tests deleted by #15371 will be restored in subsequent PRs.
Microsoft Reviewers: Open in CodeFlow