- Test A: PATCH displayName happy path → 200, GET reflects change
- Test B: PATCH isAdmin promote → 200, GET shows isAdmin true
- Test C: last-admin guard → 409 when only admin demotes self
- Test D: self-demotion → 200 when second admin exists
- Test E: non-admin PATCH → 403 (requireAdmin boundary)
- Test F: wrong-type body → 400 { error: "Invalid request" }; malformed :id → 400
- Test G: non-existent member id → 404
- Test H: GET /members includes boolean isAdmin per member
All 7 new tests fail RED for the right reasons (route 404 / isAdmin missing)
Lucas Berger
a0a82ac9b6