Test complex React components and integration flows

Interview framing: For complex enterprise UI, tests should protect workflows and business rules without locking the implementation in place.

Testing layers:

1. Unit tests:

• Policy validation helpers.
• Permission/capability mapping.
• Data formatters and reducers.
• Edge cases around missing attributes or conflicting rules.

2. Component tests:

• Render policy forms and interact with them as a user.
• Assert visible behavior: validation messages, disabled publish button, warning banners, result summaries.
• Prefer role/label queries over test IDs when possible.

3. Integration tests:

• Mock API boundaries with realistic fixtures.
• Test loading, success, empty, 401/403, validation error, and server error states.
• Verify stale request handling for search/simulation flows.

4. E2E tests:

• Cover a few critical paths: create draft, simulate decision, publish, audit entry visible.
• Keep them stable and focused; avoid duplicating all component cases.

5. Accessibility:

• Automated checks for labels, roles, keyboard access, and color-independent status.
• Manual keyboard checks for custom dropdowns/rule builders.

CI trade-offs:

• Fast unit/component tests on every PR.
• E2E smoke tests in CI or preview environments.
• More expensive suites can run nightly or before release.

Good closing: "I want confidence in user-visible behavior and security-sensitive rules, not brittle snapshots of every markup detail."