Write Angular component tests using TestBed, ComponentHarness, and HttpTestingController with proper signal input handling. Use when writing component tests, mocking HTTP calls, or testing signal inputs.
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[WEB-TEST-01] Tripartite Naming & AAA Cadence: Test names must follow Method_Scenario_ExpectedBehavior and adhere strictly to Arrange-Act-Assert.[WEB-TEST-02] Accessible Harnesses & User Actions: Query UI components via ComponentHarness (e.g. MatButtonHarness) or accessible queries; strictly ban raw CSS class selectors or arbitrary DOM traversal.[WEB-TEST-03] Ban on Component Private State & Property Inspection: Never inspect component private state or internal properties directly. Assert on visible DOM state, output events, or harness query outcomes.[WEB-TEST-04] HTTP Boundary Mocking: Intercept HTTP requests at the boundary using provideHttpClientTesting() + HttpTestingController rather than mocking internal services or methods. Tests must verify true component data flow.[WEB-TEST-05] Bug-First Regression Lock: Every PR resolving a bug ticket or with title fix(...) must introduce a test reproducing the defect prior to the fix.[WEB-TEST-02]): Use ComponentHarness (e.g. MatButtonHarness) not CSS selectors. loader.getHarness(MatButtonHarness) + await button.click(). Never query by CSS class. See harness pattern.[WEB-TEST-04]): Intercept with provideHttpClientTesting() + HttpTestingController rather than manual mocks. Call expectOne, .flush(mockData), and verify() in afterEach.[WEB-TEST-03]): Use fixture.componentRef.setInput('name', value) + fixture.detectChanges(), not direct assignment. Signals sync — no fakeAsync needed for most signal-driven tests.@angular/build:unit-test (faster, native ESM, no Karma). Configure in angular.json. Jasmine/Karma still supported. Standalone: import directly in TestBed.configureTestingModule({ imports: [StandaloneComponent] }).[WEB-TEST-01] Vague test names: Banish non-descriptive names or mixed AAA phases; follow Method_Scenario_ExpectedBehavior.[WEB-TEST-02] Raw CSS selectors / DOM traversal: Query via ComponentHarness or accessible roles, not CSS class strings.[WEB-TEST-03] Testing private state: Never inspect internal properties or use direct @Input() assignment; use setInput().[WEB-TEST-04] Manual HttpClient mocks: Always mock the network boundary with provideHttpClientTesting() + HttpTestingController.[WEB-TEST-05] Bug fix without reproduction test: Ban bug fix PRs lacking defect regression tests.When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
Never query by CSS class
native ESM
Additional task-grounded exact anchors: ComponentHarness
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Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
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