- **Configurations:** Test minimum `SECRET_KEY` length validation to prevent weak JWT signing keys. Validate proper handling of secure defaults.
- **Permissions:** Add tests for inactive user blocking, API access control, and superuser privilege escalation across organizational roles.
- **Authentication:** Test logout safety, session revocation, token replay prevention, and defense against JWT algorithm confusion attacks.
- Include `# pragma: no cover` for unreachable defensive code in security-sensitive areas.