Write Artemis tests

Server tests

Server tests need Docker. They run against PostgreSQL through Testcontainers, locally and in CI.

./gradlew test -x webapp                                     # everything
./gradlew test --tests ExamIntegrationTest -x webapp         # one class
./gradlew test --tests ExamIntegrationTest.testGetExamScore  # one method
./gradlew test -DincludeTags='ArchitectureTest' -x webapp    # architecture only, fast

Name tests *Test.java. Reuse the module's base class where one exists.

Read reference/server.md for base class selection, the admin naming rule that forces a different @ResourceLock, date comparison, and shared-spy flakiness.

In the admin module, naming a test *IntegrationTest forces it onto a batch base class carrying a shared @ResourceLock. A test that mutates global state and needs isolation must be named *Test and extend AbstractSpringIntegrationIndependentTest instead. Enforced by src/test/java/de/tum/cit/aet/artemis/admin/architecture/AdminTestArchitectureTest.java.

Client tests

Vitest, not Jest. Use vi.spyOn(), vi.fn(), vi.clearAllMocks().

pnpm run vitest                          # watch
pnpm run vitest:run                      # single run, everything
pnpm exec vitest run <path/to/spec.ts>   # single file
pnpm run vitest:coverage
pnpm run test-diff                       # only specs affected by the diff

pnpm run vitest:run -- <path> runs the entire suite. The path is swallowed. Use pnpm exec vitest run <path> for a single file.

Vitest is not the type check CI runs. CI runs a stricter spec tsc:

pnpm run compile:tests

It enforces member visibility, which Vitest does not. A spec that reaches a private member as component.privateThing passes locally and fails in CI. Use bracket access, component['privateThing'], and run compile:tests before pushing.

Test a directive with TestBed.createDirective, not a throwaway host component. Keep a host only when the directive is structural or needs a template around it: something around or beside it, content Angular keeps rendering inside it, a static attribute its constructor reads, or an input that takes a TemplateRef or a component instance from the same template. Input bindings apply on the first detectChanges().

Read reference/client.md for the rest: the createDirective pattern and its limits, the monaco stub, zoneless test setup, model() versus input() plus output(), and why template errors need a build rather than a test run.

Both

Keep tests deterministic. Mock external services and WebSockets. CI enforces per-module coverage thresholds, so a new class with no test can fail the build even when nothing is broken.

For E2E tests, see skills/e2e-pr-check/SKILL.md. Do not add a Playwright test for behavior that a unit or integration test can cover.