write-xaml-tests

# Write XAML Tests Skill Creates XAML unit tests that verify XAML parsing, XamlC compilation, and source generation behavior. ## When to Use - ✅ Testing XAML parsing/inflation behavior - ✅ Testing XamlC (IL generation) correctness - ✅ Testing Source Generator output - ✅ XAML-specific bugs (bindings, markup extensions, x:Name, etc.) ## When NOT to Use - ❌ Testing UI interactions or visual behavior → Use `write-ui-tests` skill - ❌ Testing runtime behavior after page loads → Use `write-ui-tests` skill - ❌ Testing platform-specific rendering → Use `write-ui-tests` skill ## Required Input Before invoking, ensure you have: - **Issue number** (e.g., 12345) - **Issue description** - what XAML behavior is broken - **Expected vs actual behavior** ## Workflow ### Step 1: Read the XAML Unit Test Guidelines ```bash cat .github/instructions/xaml-unittests.instructions.md ``` This contains the authoritative conventions for: - File naming (`MauiXXXXX.xaml` and `MauiXXXXX.xaml.cs`) - File location (`src/Controls/tests/Xaml.UnitTests/Issues/`) - Test patterns with `[Values] XamlInflator` - XamlC testing with `MockCompiler` - Source Generator testing with `MockSourceGenerator` - Special file extensions for invalid codegen (`.rt.xaml`, `.rtsg.xaml`, `.rtxc.xaml`) ### Step 2: Create Test Files Following the conventions from Step 1, create: - `src/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xaml` - `src/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xaml.cs` ### Step 3: Verify Tests Compile and Run ```bash # Build the test project dotnet build src/Controls/tests/Xaml.UnitTests/Controls.Xaml.UnitTests.csproj -c Debug --no-restore -v q # Run specific test dotnet test src/Controls/tests/Xaml.UnitTests/Controls.Xaml.UnitTests.csproj --filter "FullyQualifiedName~MauiXXXXX" --no-build ``` ### Step 4: Verify Test Behavior - **For bug reproduction tests**: Tests should FAIL before fix, PASS after fix - **For regression tests**: Tests should PASS to confirm behavior works ## Output After completion, report: ```markdown ✅ XAML unit test created for Issue #XXXXX **Files:** - `src/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xaml` - `src/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xaml.cs` **Test method:** `DescriptiveTestName` **Inflators tested:** Runtime, XamlC, SourceGen **Verification:** Tests [PASS/FAIL] as expected ``` ## References - **Full conventions:** `.github/instructions/xaml-unittests.instructions.md` - **Test project:** `src/Controls/tests/Xaml.UnitTests/` - **Existing issue tests:** `src/Controls/tests/Xaml.UnitTests/Issues/`