[CI Doctor] PR #34498 CI failures: macOS build (51 errors) + Microsoft.Maui.Client.UnitTests failures (2 tests)

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Summary

PR #34498 ("Add Microsoft.Maui.Client tool") has two distinct CI failures: (1) the macOS Release build crashes with 51 compiler errors in Maui.Controls.Sample targeting net10.0-ios, and (2) the new Microsoft.Maui.Client.UnitTests work item fails with 2 test assertion mismatches on both Windows Debug and Release Helix queues.

Build Details

Field	Value
Pipeline	maui-pr (Definition 302)
Build	#1353764
Branch	refs/pull/34498/merge
PR	#34498 — Add Microsoft.Maui.Client tool for cross-platform device and SDK management
Author	@rmarinho
Commit	3172ea61cdae
Duration	2026-03-26T13:55 → 15:54 (≈2h)

Failed Jobs

#	Job	Error Summary	Helix?
1	Build macOS (Release)	51 CS compiler errors in Maui.Controls.Sample for net10.0-ios TFM	No
2	Windows Helix Unit Tests (Debug)	Microsoft.Maui.Client.UnitTests.dll — 2 tests failed	Yes
3	Windows Helix Unit Tests (Release)	Microsoft.Maui.Client.UnitTests.dll — 2 tests failed	Yes

---

Failure 1: Build macOS (Release) — 51 Compiler Errors

File: src/Controls/samples/Controls.Sample/Maui.Controls.Sample.csproj (TFM: net10.0-ios)

Three classes of errors were emitted:

A) Android platform files compiled for iOS TFM (CS0246):

Platforms/Android/MainActivity.cs(1,7): error CS0246: The type or namespace name 'Android' could not be found [TargetFramework=net10.0-ios]
Platforms/Android/MainApplication.cs(2,7): error CS0246: The type or namespace name 'Android' could not be found [TargetFramework=net10.0-ios]
```

**B) MacCatalyst platform files duplicated for iOS TFM (CS0101):**
```
Platforms/MacCatalyst/AppDelegate.cs(14,15): error CS0101: The namespace 'Maui.Controls.Sample.Platform' already contains a definition for 'AppDelegate' [TargetFramework=net10.0-ios]
Platforms/MacCatalyst/Main.cs(6,15): error CS0101: The namespace 'Maui.Controls.Sample.Platform' already contains a definition for 'Application' [TargetFramework=net10.0-ios]
Platforms/MacCatalyst/SceneDelegate.cs(9,15): error CS0101: The namespace 'Maui.Controls.Sample.Platform' already contains a definition for 'SceneDelegate' [TargetFramework=net10.0-ios]
```

**C) Page lifecycle methods not found to override (CS0115) — 12 files affected:**
```
Pages/Core/DragAndDropBetweenLayouts.xaml.cs(31,27): error CS0115: 'OnAppearing()': no suitable method found to override
Pages/Core/FlyoutPageGallery.xaml.cs(26,27): error CS0115: 'OnNavigatedTo(NavigatedToEventArgs)': no suitable method found to override
Pages/Core/FlyoutPageGallery.xaml.cs(41,27): error CS0115: 'OnNavigatedFrom(NavigatedFromEventArgs)': no suitable method found to override
Pages/Core/ModalPage.xaml.cs(19,27): error CS0115: 'OnNavigatingFrom(NavigatingFromEventArgs)': no suitable method found to override
Pages/Core/ModalPage.xaml.cs(25,27): error CS0115: 'OnNavigatedTo(NavigatedToEventArgs)': no suitable method found to override
Pages/Core/ModalPage.xaml.cs(41,27): error CS0115: 'OnAppearing()': no suitable method found to override
... (+ 6 more in ScrollViewOrientationPage, DatePickerPage, PickerPage, WebViewGallery, etc.)
```

**Possible root cause for error class C:** The PR updated `eng/Version.Details.xml` and `eng/Versions.props`. A dependency version bump may have brought in a build of MAUI where these lifecycle virtual methods were removed or renamed, causing the sample to fail to compile against the new SDK.

---

## Failure 2: Microsoft.Maui.Client.UnitTests — 2 Test Failures

Helix jobs (Windows Debug: `b7f27aa0-8338-41de-8277-6c94d15bd6cc`, Windows Release: `bdc02c81-f17a-4b77-9848-1b2f807d7c46`, macOS Debug: `e28ec8b6-cf95-4028-a015-38a245715dfa`) all failed on `Microsoft.Maui.Client.UnitTests.dll`.

**Test 1:** `JdkManagerValidateInstallPathTests.ValidateInstallPath_ShallowPath_Throws`
```
Assert.Contains() Failure: Sub-string not found
String:    "Refusing to use system directory as insta"...
Not found: "too shallow"
Stack trace: /_/src/Tools/tests/Microsoft.Maui.Client.UnitTests/ProcessRunnerTests.cs(154,0)
```
The production error message does not contain "too shallow" — the test expects one string, the code emits another.

**Test 2:** `DoctorServiceTests.RunAllChecksAsync_SetsStatusBasedOnChecks`
```
Assert.NotEqual() Failure: Values are equal
Expected: Not Unhealthy
Actual:       Unhealthy
Stack trace: /_/src/Tools/tests/Microsoft.Maui.Client.UnitTests/DoctorServiceTests.cs(105,0)

A doctor health check is returning Unhealthy when the test expects it to be healthy.

---

Root Cause Assessment

Failure	Category	Confidence	Notes
macOS CS0246/CS0101 errors	Code — Platform file glob / csproj issue	Medium	Android/MacCatalyst files unexpectedly included in net10.0-ios TFM build
macOS CS0115 errors	Code — API breaking change from version bump	Medium	OnAppearing, OnNavigatedTo, etc. not found; suspect eng/Versions.props change
Helix unit test failures	Code — Test/implementation mismatch	High	New tool added with failing assertions; tests check for strings that don't match production code

---

Recommended Actions

• Fix test string mismatch in src/Tools/tests/Microsoft.Maui.Client.UnitTests/ProcessRunnerTests.cs line 154 — update expected error message from "too shallow" to match the actual error text "Refusing to use system directory as...", or fix the production error message.
• Fix DoctorService health check — investigate src/Tools/tests/Microsoft.Maui.Client.UnitTests/DoctorServiceTests.cs line 105 to understand why a check returns Unhealthy when it should not.
• Investigate macOS CS0115 errors — check if eng/Versions.props introduced a dependency with a breaking API change (removed OnAppearing, OnNavigatedTo, OnNavigatingFrom virtual overrides from Page).
• Investigate CS0246/CS0101 platform file errors — verify Maui.Controls.Sample.csproj is not inadvertently including Android and duplicate MacCatalyst files for the net10.0-ios TFM; check if any .csproj glob was changed in this PR.

Related

• Build 1353764
• Helix Windows Debug job
• Helix Windows Release job
• PR Add Microsoft.Maui.Client tool for cross-platform device and SDK management #34498 — Add Microsoft.Maui.Client tool for cross-platform device and SDK management

Note

🔒 Integrity filtering filtered 2 items

Integrity filtering activated and filtered the following items during workflow execution.
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• issue:#0 (search_issues: Resource 'issue:#0' has lower integrity than agent requires. Agent would need to drop integrity tags [unapproved:all approved:all] to trust this resource.)
• pr:Add Microsoft.Maui.Client tool for cross-platform device and SDK management #34498 (pull_request_read: Resource 'pr:Add Microsoft.Maui.Client tool for cross-platform device and SDK management #34498' has lower integrity than agent requires. Agent would need to drop integrity tags [unapproved:all approved:all] to trust this resource.)

🩺 Diagnosis by CI Failure Doctor for dotnet/maui

• expires on Apr 2, 2026, 7:10 PM UTC