# QA Results: Community Profile Sync (m9-community-profile-sync)

## Test Execution Summary

| Suite | Command | Result | Count |
|-------|---------|--------|-------|
| Unit + lib tests | `cargo test --lib` | PASS | 1299 passed, 0 failed |
| Integration: m9_community_sync | `cargo test --test m9_community_sync` | PASS | 10 passed, 0 failed |
| Clippy lint gate | `cargo clippy --lib -- -D warnings` | PASS | 0 warnings |
| Format check | `cargo fmt --check` | PASS | clean |

**Overall: PASS**

---

## Integration Test Results (m9_community_sync)

Execution time: 4.63s

| Test | Result |
|------|--------|
| `join_and_query_membership` | ok |
| `join_idempotent` | ok |
| `invalid_community_name_empty` | ok |
| `invalid_community_name_too_long` | ok |
| `signal_routes_to_community_aggregate` | ok |
| `nonmember_signal_not_forwarded` | ok |
| `forwarding_does_not_block_primary_write` | ok |
| `multiple_communities_independent` | ok |
| `community_aggregate_windowed_count` | ok |
| `membership_persists_across_restart` | ok |

All 10 integration tests passed. Tests cover the full feature surface:
- Membership join + query API
- Idempotent join
- Input validation (empty name, name > 64 chars)
- Signal forwarding to CohortSignalLedger
- Gate: non-member signals are not forwarded
- Primary write path unblocked (best-effort semantics)
- Multiple independent communities per user
- Windowed counts on community aggregates
- Membership durability across process restart

---

## Regression Check

The 1299 lib unit tests cover all prior milestones (m1–m8) and the new m9 components. Zero regressions introduced by this feature.

---

## Acceptance Criteria Verification

| Criterion | Status |
|-----------|--------|
| `join_community(user_id, community)` persists via `Tag::CommunityMembership` | PASS (membership_persists_across_restart) |
| In-memory `CommunityMembershipIndex` rebuilt on startup | PASS (membership_persists_across_restart) |
| `signal_with_context` forwards to `CohortSignalLedger` for members | PASS (signal_routes_to_community_aggregate) |
| Non-members are not forwarded | PASS (nonmember_signal_not_forwarded) |
| Forwarding is best-effort, primary write not blocked | PASS (forwarding_does_not_block_primary_write) |
| Community aggregates support windowed counts | PASS (community_aggregate_windowed_count) |
| Community name validated (non-empty, max 64 chars) | PASS (invalid_community_name_empty, invalid_community_name_too_long) |
| Multiple communities per user are independent | PASS (multiple_communities_independent) |

**All 8 acceptance criteria verified: PASS**

---

## Open Issues

- **Medium (non-blocking):** No cap on `CommunityMembershipIndex` entries per user. In adversarial conditions a user could join O(N) communities causing memory growth. Tracked as future work.

---

## Verdict: PASS