fix(test): stop leaked coroutine scopes poisoning tests

[jamesarich]

A full spotlessApply spotlessCheck detekt assembleDebug test allTests kmpSmokeCompile run reported BUILD SUCCESSFUL while the JUnit XML recorded a real failure. Develocity test retry was configured with failOnPassedAfterRetry = false, so an ordering flake that passed on retry was reported as success. Reproducing the underlying flake showed 5 of 10 runs failing — every one of them green. The cause was two independent coroutine leaks that let a job outlive the test that started it and fail whichever test happened to run next.

🐛 Bug Fixes

• MeshUtilApplication: don't escalate background-init failures to the global uncaught handler. onCreate launches four best-effort init jobs on the real Dispatchers.Default, and Robolectric never calls onTerminate() to cancel them. The test body finishes in milliseconds while a background thread is still resolving the Koin graph (DiscoveryScanEngine → RadioController → CommandSenderImpl → PacketHandlerImpl) against a torn-down environment. It throws, and with no CoroutineExceptionHandler on the scope the failure reached the global uncaught handler and was attributed to an unrelated test. SupervisorJob already declares that a child's failure must not take down its siblings, so escalating to a process-level crash contradicted that intent; the handler completes it and Logger.e still reports the failure.
• Stop ScannerViewModel tests leaking their ViewModel. ScannerViewModelTest and AndroidScannerViewModelBondingTest hand-build a ViewModel and call Dispatchers.resetMain() without ever clearing it, so viewModelScope jobs survive every test. A job suspended on a real-dispatcher result — compose-resources resolves on an internal Dispatchers.Default scope — then resumes onto a Main that resetMain() has already unset, which throws and surfaces as UncaughtExceptionsBeforeTest on the next test. The window between resetMain() and the next setMain() is microseconds wide, which is why this flaked so rarely.

🛠️ Refactoring & Architecture

• Added MeshUtilApplication.cancelBackgroundInit() (@VisibleForTesting) as the single shutdown seam, called by onTerminate() and by the two Robolectric tests that boot the real Application (CoilImageLoaderLifecycleTest explicitly, ShareMessageDeepLinkTest implicitly via the manifest).
• Added ScannerViewModelHarness.clearViewModel(viewModel) so the shared harness owns the teardown and any future test built on it inherits the fix.

🧹 Chores

• failOnPassedAfterRetry = true. Retry still isolates an ordering flake to one worker, but the build no longer reports success over a recorded <failure>. This will make genuinely flaky runs red rather than silently green, which may surface other latent flakes.

Testing Performed

Judged by counting <failure> elements in build/test-results/**/TEST-*.xml, never by the Gradle verdict — retry masking is exactly what hid the original bug.

• :androidApp:testGoogleDebugUnitTest x10: 5/10 failed before, 10/10 clean after. Every pre-fix failure reported gradleExit=0. The failure moved between MapViewModelSitePlannerRequestTest and NavigationAssemblyTest across runs — the signature of a cross-class leak landing on an innocent test.
• ScannerViewModelTest / AndroidScannerViewModelBondingTest: verified with a temporary probe that armed a viewModelScope.launch { awaitCancellation() } in @BeforeTest and asserted in a later test that the previous test's job was cancelled. Failed before the fix (StandaloneCoroutine{Active}), passed after. Probe removed before commit; no new test cases added.
• spotlessCheck detekt assembleGoogleDebug test allTests: green, with zero <failure>/<error> elements across all 685 result XMLs. MapViewModelSitePlannerRequestTest is back to tests="3" (the tests="4" retry entry is gone).

Note: the pre-existing warmScanFailureStrings() helper is retained — it fixes the timing race those tests need for virtual-time cooldown assertions, but it is opt-in per test and never addressed the leak.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes

  • Improved handling and logging of background initialization failures.
  • Reduced the risk of asynchronous background work affecting app shutdown and test environments.

• Tests

  • Improved cleanup of image loading, deep-link, and connection-related test scenarios.
  • Ensured ViewModel activity is stopped cleanly before test environments are reset.
  • Test retries now correctly flag cases that only pass after retry.

[coderabbitai]

📝 Walkthrough

Walkthrough

The application now logs uncaught background initialization failures and exposes explicit cancellation for tests. Robolectric and ViewModel tests cancel coroutine scopes during teardown. Develocity retries now fail the build when tests pass only after retry.

Changes

Test lifecycle hardening

Layer / File(s)	Summary
Application scope cleanup androidApp/src/main/kotlin/org/meshtastic/app/MeshUtilApplication.kt, androidApp/src/test/kotlin/org/meshtastic/app/*	MeshUtilApplication logs uncaught background initialization failures and exposes cancelBackgroundInit(). Application tests call it during teardown.
ViewModel scope cleanup feature/connections/src/commonTest/kotlin/org/meshtastic/feature/connections/ScannerViewModelHarness.kt, feature/connections/src/commonTest/kotlin/org/meshtastic/feature/connections/ScannerViewModelTest.kt, feature/connections/src/androidHostTest/kotlin/org/meshtastic/feature/connections/AndroidScannerViewModelBondingTest.kt	The test harness cancels viewModelScope before tests reset the main dispatcher.
Retry failure enforcement build-logic/convention/src/main/kotlin/org/meshtastic/buildlogic/ProjectExtensions.kt	Develocity test retries now fail the build when the initial attempt fails.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Mergeability Score: 🟡 Moderate · up to d3cdf

The PR adds cancellation for application initialization and clears test ViewModels, but one teardown path does not wait for background children to finish. Work may therefore outlive Robolectric teardown and reintroduce cross-test failures, so cleanup should be synchronized before merging.

Possibly related PRs

• meshtastic/Meshtastic-Android#6598: Related coroutine lifecycle and test-isolation changes.
• meshtastic/Meshtastic-Android#6644: Related MeshUtilApplication background coroutine cleanup in Robolectric tests.
• meshtastic/Meshtastic-Android#6669: Related ViewModel and background scope cleanup during test teardown.

Suggested labels: testing

Suggested reviewers: jeremiah-k

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Tests Prove The Path, Not The End State	⚠️ Warning	The diff only adds teardown calls; no changed test asserts that application or ViewModel jobs are cancelled, so cleanup implementations could be no-ops and test assertions would still pass.	Add regression tests that launch a child job, invoke each cleanup seam, and assert the job is cancelled; also test the background-init failure handling side effect.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: fixing leaked coroutine scopes that caused test failures.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Sibling Call Sites And Presence Semantics	✅ Passed	The diff changes coroutine lifecycle, test cleanup, and retry configuration only. It introduces no nullable field, presence check, removed zero-guard, or physical measurement default.

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@androidApp/src/main/kotlin/org/meshtastic/app/MeshUtilApplication.kt`:
- Around line 162-164: Update cancelBackgroundInit and the Robolectric teardown
paths to provide a test-only suspend cleanup operation that cancels
applicationScope and waits for all its children to complete, including
restoreInterruptedSessionsOnReconnect. Use this awaited cleanup from both
teardowns while keeping onTerminate non-blocking.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Run ID: 0c91f6d9-f925-44a1-a19c-89db51004644

📥 Commits

Reviewing files that changed from the base of the PR and between 7730823 and d3cdf03.

📒 Files selected for processing (7)

• androidApp/src/main/kotlin/org/meshtastic/app/MeshUtilApplication.kt
• androidApp/src/test/kotlin/org/meshtastic/app/CoilImageLoaderLifecycleTest.kt
• androidApp/src/test/kotlin/org/meshtastic/app/ShareMessageDeepLinkTest.kt
• build-logic/convention/src/main/kotlin/org/meshtastic/buildlogic/ProjectExtensions.kt
• feature/connections/src/androidHostTest/kotlin/org/meshtastic/feature/connections/AndroidScannerViewModelBondingTest.kt
• feature/connections/src/commonTest/kotlin/org/meshtastic/feature/connections/ScannerViewModelHarness.kt
• feature/connections/src/commonTest/kotlin/org/meshtastic/feature/connections/ScannerViewModelTest.kt