New E2E tests should be created in apps/prairielearn/src/tests/e2e. Each test file should be named *.spec.{ts,tsx} and contain tests for a specific feature or user flow.
expect and test should be imported from apps/prairielearn/src/tests/e2e/fixtures.ts. These include fixtures to start the PrairieLearn server and provide an editable test course.
Prefer using selectors that use user-facing content, such as getByRole, getByText, and getByLabel. If that's impractical, consider using getByTestId instead. Add data-testid attributes or aria-label to page components when needed. Avoid using locator() with implementation details like CSS classes or IDs unless absolutely necessary.
Playwright e2e tests run fully in parallel (fullyParallel: true). Each test must be self-contained — set up its own state (users, enrollments, etc.) rather than relying on shared mutable state from beforeAll. Use the courseInstance fixture for the default course instance. Don't use module-level variables to share state between tests.
