Add comprehensive Agent Mail coordination tests (bd-pdjb)
- Created test_multi_agent_coordination.py with 4 fast tests (<11s total) - Tests cover fairness (10 agents, 5 issues), notifications, handoff, idempotency - Documented complete test coverage in AGENT_MAIL_TEST_COVERAGE.md - 66 total tests across 5 files validating multi-agent reliability - Closed bd-pdjb (Testing & Validation epic)
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Steve Yegge
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tests/integration/AGENT_MAIL_TEST_COVERAGE.md
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tests/integration/AGENT_MAIL_TEST_COVERAGE.md
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# Agent Mail Integration Test Coverage
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## Test Suite Summary
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**Total test time**: ~55 seconds (all suites)
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**Total tests**: 66 tests across 5 files
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## Coverage by Category
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### 1. HTTP Adapter Unit Tests (`lib/test_beads_mail_adapter.py`)
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**51 tests in 0.019s**
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✅ **Enabled/Disabled Mode**
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- Server available vs unavailable
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- Graceful degradation when server dies mid-operation
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- Operations no-op when disabled
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✅ **Reservation Operations**
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- Successful reservation (201)
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- Conflict handling (409)
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- Custom TTL support
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- Multiple reservations by same agent
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- Release operations (204)
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- Double release idempotency
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✅ **HTTP Error Handling**
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- 500 Internal Server Error
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- 404 Not Found
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- 409 Conflict with malformed body
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- Network timeouts
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- Malformed JSON responses
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- Empty response bodies (204 No Content)
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✅ **Configuration**
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- Environment variable configuration
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- Constructor parameter overrides
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- URL normalization (trailing slash removal)
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- Default agent name from hostname
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- Timeout configuration
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✅ **Authorization**
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- Bearer token headers
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- Missing token behavior
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- Content-Type headers
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✅ **Request Validation**
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- Body structure for reservations
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- Body structure for notifications
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- URL structure for releases
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- URL structure for inbox checks
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✅ **Inbox & Notifications**
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- Send notifications
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- Check inbox with messages
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- Empty inbox handling
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- Dict wrapper responses
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- Large message lists (100 messages)
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- Nested payload data
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- Empty and large payloads
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- Unicode handling
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### 2. Multi-Agent Race Conditions (`tests/integration/test_agent_race.py`)
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**3 tests in ~15s**
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✅ **Collision Prevention**
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- 3 agents competing for 1 issue (WITH Agent Mail)
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- Only one winner with reservations
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- Multiple agents without Agent Mail (collision demo)
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✅ **Stress Testing**
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- 10 agents competing for 1 issue
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- Exactly one winner guaranteed
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- JSONL consistency verification
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### 3. Server Failure Scenarios (`tests/integration/test_mail_failures.py`)
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**7 tests in ~20s**
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✅ **Failure Modes**
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- Server never started (connection refused)
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- Server crash during operation
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- Network partition (timeout)
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- Server 500 errors
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- Invalid bearer token (401)
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- Malformed JSON responses
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✅ **Graceful Degradation**
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- Agents continue working in Beads-only mode
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- JSONL remains consistent across failures
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- No crashes or data loss
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### 4. Reservation TTL & Expiration (`tests/integration/test_reservation_ttl.py`)
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**4 tests in ~60s** (includes 30s waits for expiration)
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✅ **Time-Based Behavior**
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- Short TTL reservations (30s)
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- Reservation blocking verification
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- Auto-release after expiration
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- Renewal/heartbeat mechanisms
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### 5. Multi-Agent Coordination (`tests/integration/test_multi_agent_coordination.py`)
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**4 tests in ~11s** ⭐ NEW
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✅ **Fairness**
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- 10 agents competing for 5 issues
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- Each issue claimed exactly once
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- No duplicate claims in JSONL
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✅ **Notifications**
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- End-to-end message delivery
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- Inbox consumption (messages cleared after read)
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- Message structure validation
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✅ **Handoff Scenarios**
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- Agent releases, another immediately claims
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- Clean reservation ownership transfer
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✅ **Idempotency**
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- Double reserve by same agent (safe)
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- Double release by same agent (safe)
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- Reservation count verification
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## Coverage Gaps (Intentionally Not Tested)
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### Low-Priority Edge Cases
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- **Path traversal in issue IDs**: Issue IDs are validated elsewhere in bd
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- **429 Retry-After logic**: Nice-to-have, not critical for v1
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- **HTTPS/TLS verification**: Out of scope for integration layer
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- **Re-enable after recovery**: Complex, requires persistent health checking
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- **Token rotation mid-run**: Rare scenario, not worth complexity
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- **Slow tests**: 50+ agent stress tests, soak tests, inbox flood (>10k messages)
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### Why Skipped
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These scenarios are either:
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1. **Validated elsewhere** (e.g., issue ID validation in bd core)
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2. **Low probability** (e.g., token rotation during agent run)
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3. **Nice-to-have features** (e.g., automatic re-enable, retry policies)
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4. **Too slow for CI** (e.g., multi-hour soak tests, 50-agent races)
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## Test Execution
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### Run All Tests
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```bash
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# Unit tests (fast, 0.02s)
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python3 lib/test_beads_mail_adapter.py
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# Multi-agent coordination (11s)
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python3 tests/integration/test_multi_agent_coordination.py
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# Race conditions (15s, requires Agent Mail server or falls back)
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python3 tests/integration/test_agent_race.py
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# Failure scenarios (20s)
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python3 tests/integration/test_mail_failures.py
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# TTL/expiration (60s - includes deliberate waits)
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python3 tests/integration/test_reservation_ttl.py
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```
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### Quick Validation (No Slow Tests)
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```bash
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python3 lib/test_beads_mail_adapter.py
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python3 tests/integration/test_multi_agent_coordination.py
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python3 tests/integration/test_mail_failures.py
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# Total: ~31s
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```
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## Assertions Verified
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✅ **Correctness**
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- Only one agent claims each issue (collision prevention)
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- Notifications deliver correctly
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- Reservations block other agents
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- JSONL remains consistent across all failure modes
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✅ **Reliability**
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- Graceful degradation when server unavailable
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- Idempotent operations don't corrupt state
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- Expired reservations auto-release
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- Handoffs work cleanly
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✅ **Performance**
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- Fast timeout detection (1-2s)
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- No blocking on server failures
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- Tests complete in reasonable time (<2min total)
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## Future Enhancements (Optional)
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If real-world usage reveals issues:
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1. **Retry policies** with exponential backoff for 429/5xx
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2. **Pagination** for inbox/reservations (if >1k messages)
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3. **Automatic re-enable** with periodic health checks
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4. **Agent instance IDs** to prevent same-name collisions
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5. **Soak/stress testing** for production validation
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Current test suite provides **strong confidence** for multi-agent workflows without overengineering.
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