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+# FIFO Ordering Integration Tests - Execution Plan
+
+**Date**: 2025-01-27  
+**Status**: Ready for Execution  
+**Priority**: P0 - Critical  
+
+## Overview
+
+Comprehensive integration and stress tests have been created to validate the FIFO policy execution ordering system. These tests verify end-to-end correctness, performance under load, and edge case handling.
+
+## Test Suite Location
+
+**File**: `crates/executor/tests/fifo_ordering_integration_test.rs`
+
+## Test Coverage
+
+### 1. Basic Integration Test: `test_fifo_ordering_with_database`
+**Purpose**: Verify FIFO ordering with database persistence  
+**Scenario**: 10 executions, concurrency=1  
+**Validates**:
+- Database execution creation
+- Queue manager integration
+- Queue stats persistence to database
+- Strict FIFO ordering
+- Completion notification flow
+
+**Expected Runtime**: ~2-3 seconds
+
+---
+
+### 2. High Concurrency Stress Test: `test_high_concurrency_stress`
+**Purpose**: Validate ordering under heavy load  
+**Scenario**: 1000 executions, concurrency=5  
+**Validates**:
+- FIFO ordering maintained at scale
+- Queue stats accuracy under load
+- Performance characteristics (throughput)
+- Memory efficiency
+- Database write performance
+
+**Expected Runtime**: ~30-60 seconds  
+**Expected Throughput**: >100 exec/sec
+
+---
+
+### 3. Multiple Workers Simulation: `test_multiple_workers_simulation`
+**Purpose**: Simulate real-world worker behavior  
+**Scenario**: 30 executions, 3 workers with varying speeds  
+**Validates**:
+- FIFO ordering independent of worker speed
+- Worker completion rate tracking
+- Load distribution across workers
+- Async notification correctness
+
+**Expected Runtime**: ~5-10 seconds
+
+---
+
+### 4. Cross-Action Independence: `test_cross_action_independence`
+**Purpose**: Ensure actions don't interfere with each other  
+**Scenario**: 3 actions × 50 executions each (150 total)  
+**Validates**:
+- Separate queues per action
+- Concurrent action execution
+- Independent queue statistics
+- Interleaved completion handling
+
+**Expected Runtime**: ~10-15 seconds
+
+---
+
+### 5. Cancellation Test: `test_cancellation_during_queue`
+**Purpose**: Verify cancellation removes from queue correctly  
+**Scenario**: 10 queued executions, cancel 3 specific positions  
+**Validates**:
+- Cancellation removes correct execution
+- Queue length decreases appropriately
+- Remaining executions proceed in order
+- Cancelled tasks return errors
+
+**Expected Runtime**: ~2-3 seconds
+
+---
+
+### 6. Queue Stats Persistence: `test_queue_stats_persistence`
+**Purpose**: Verify database sync during execution  
+**Scenario**: 50 executions with periodic stats checks  
+**Validates**:
+- Memory and database stats match
+- Real-time stats updates
+- Final stats accuracy
+- Database write consistency
+
+**Expected Runtime**: ~5-10 seconds
+
+---
+
+### 7. Queue Full Rejection: `test_queue_full_rejection`
+**Purpose**: Test queue limit enforcement  
+**Scenario**: Fill queue to max_queue_length (10), attempt overflow  
+**Validates**:
+- Queue full detection
+- Rejection with clear error message
+- Stats accuracy at capacity
+- No memory overflow
+
+**Expected Runtime**: ~2 seconds
+
+---
+
+### 8. Extreme Stress Test: `test_extreme_stress_10k_executions`
+**Purpose**: Validate system under extreme load  
+**Scenario**: 10,000 executions, concurrency=10  
+**Validates**:
+- FIFO ordering at extreme scale
+- Memory stability
+- Database performance
+- No resource leaks
+- Throughput metrics
+
+**Expected Runtime**: ~5-10 minutes  
+**Note**: This is marked `#[ignore]` and should be run separately
+
+---
+
+## Execution Instructions
+
+### Prerequisites
+
+1. **Database Setup**:
+   ```bash
+   # Ensure PostgreSQL is running
+   sudo systemctl start postgresql
+   
+   # Apply latest migrations
+   cd attune
+   sqlx migrate run
+   ```
+
+2. **Environment Configuration**:
+   ```bash
+   # Ensure config.development.yaml has correct database URL
+   # Or set environment variable:
+   export ATTUNE__DATABASE__URL="postgresql://attune:attune@localhost/attune"
+   ```
+
+### Running Tests
+
+#### Run All Tests (Except Extreme Stress)
+```bash
+cd attune/crates/executor
+cargo test --test fifo_ordering_integration_test -- --ignored --test-threads=1
+```
+
+**Important**: Use `--test-threads=1` to avoid database contention between tests.
+
+#### Run Individual Test
+```bash
+# Basic integration test
+cargo test --test fifo_ordering_integration_test test_fifo_ordering_with_database -- --ignored --nocapture
+
+# High concurrency stress test
+cargo test --test fifo_ordering_integration_test test_high_concurrency_stress -- --ignored --nocapture
+
+# Multiple workers simulation
+cargo test --test fifo_ordering_integration_test test_multiple_workers_simulation -- --ignored --nocapture
+```
+
+#### Run Extreme Stress Test (Separately)
+```bash
+# Run with verbose output to see progress
+cargo test --test fifo_ordering_integration_test test_extreme_stress_10k_executions -- --ignored --nocapture --test-threads=1
+```
+
+### Expected Output
+
+All tests should:
+- ✅ Pass with `test result: ok`
+- ✅ Show progress messages during execution
+- ✅ Report throughput metrics (stress tests)
+- ✅ Complete within expected runtime
+- ✅ Clean up test data automatically
+
+---
+
+## Performance Benchmarks
+
+### Target Metrics
+
+| Metric | Target | Acceptable |
+|--------|--------|------------|
+| Throughput (1000 exec) | >200/sec | >100/sec |
+| Throughput (10k exec) | >500/sec | >300/sec |
+| Memory per queued exec | <1 KB | <5 KB |
+| Queue stats DB write | <5ms | <10ms |
+| Cancellation latency | <1ms | <5ms |
+
+### Measuring Performance
+
+```bash
+# Run with timing
+time cargo test --test fifo_ordering_integration_test test_high_concurrency_stress -- --ignored --nocapture
+
+# Monitor memory usage
+/usr/bin/time -v cargo test --test fifo_ordering_integration_test test_extreme_stress_10k_executions -- --ignored --nocapture
+```
+
+---
+
+## Troubleshooting
+
+### Test Failures
+
+#### Database Connection Issues
+```
+Error: Failed to connect to database
+```
+**Solution**: Ensure PostgreSQL is running and connection URL is correct.
+
+#### Queue Full Errors During Tests
+```
+Error: Queue full (max length: 10000)
+```
+**Solution**: Increase `max_queue_length` in test config or reduce concurrent spawns.
+
+#### Timeout Errors
+```
+Error: Execution timed out waiting for queue slot
+```
+**Solution**: Increase `queue_timeout_seconds` or check for completion notification issues.
+
+#### FIFO Order Violations
+```
+assertion failed: order == expected
+```
+**Solution**: This is a CRITICAL bug. Check:
+- Notify mechanism is working
+- Queue entry/exit logic
+- Lock ordering
+- Race conditions in queue manager
+
+### Database Cleanup
+
+If tests crash and leave test data:
+```sql
+-- Clean up test data
+DELETE FROM attune.queue_stats WHERE action_id IN (
+    SELECT id FROM attune.action WHERE pack IN (
+        SELECT id FROM attune.pack WHERE ref LIKE 'fifo_test_pack_%'
+    )
+);
+
+DELETE FROM attune.execution WHERE action IN (
+    SELECT id FROM attune.action WHERE pack IN (
+        SELECT id FROM attune.pack WHERE ref LIKE 'fifo_test_pack_%'
+    )
+);
+
+DELETE FROM attune.action WHERE pack IN (
+    SELECT id FROM attune.pack WHERE ref LIKE 'fifo_test_pack_%'
+);
+
+DELETE FROM attune.pack WHERE ref LIKE 'fifo_test_pack_%';
+```
+
+---
+
+## Test Maintenance
+
+### Adding New Tests
+
+When adding new test scenarios:
+
+1. **Follow naming convention**: `test_<scenario_description>`
+2. **Mark as `#[ignore]`**: All tests require database
+3. **Use unique suffix**: Include timestamp to avoid conflicts
+4. **Clean up data**: Always call `cleanup_test_data()` at end
+5. **Document expectations**: Add comments explaining what's validated
+
+### Updating Tests
+
+When modifying queue manager behavior:
+
+1. Review all tests for assumptions
+2. Update expected values if behavior changes
+3. Add new tests for new features
+4. Run full suite before committing
+
+---
+
+## Integration with CI/CD
+
+### GitHub Actions Workflow (Future)
+
+```yaml
+name: FIFO Integration Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    services:
+      postgres:
+        image: postgres:14
+        env:
+          POSTGRES_DB: attune
+          POSTGRES_USER: attune
+          POSTGRES_PASSWORD: attune
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+    
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run migrations
+        run: sqlx migrate run
+      - name: Run integration tests
+        run: |
+          cargo test --test fifo_ordering_integration_test -- --ignored --test-threads=1
+      - name: Run stress test
+        if: github.ref == 'refs/heads/main'
+        run: |
+          cargo test --test fifo_ordering_integration_test test_high_concurrency_stress -- --ignored --nocapture
+```
+
+---
+
+## Success Criteria
+
+All tests must:
+- ✅ Pass consistently (3+ consecutive runs)
+- ✅ Maintain strict FIFO ordering
+- ✅ Complete within 2x expected runtime
+- ✅ Show no memory leaks (valgrind/miri)
+- ✅ Clean up all test data
+- ✅ Work with concurrent test runs
+
+---
+
+## Next Steps
+
+1. **Run Test Suite**: Execute all tests and verify they pass
+2. **Document Results**: Record actual performance metrics
+3. **Fix Any Issues**: Address test failures before production
+4. **Update TODO**: Mark Step 7 as complete
+5. **Proceed to Step 8**: Documentation and production readiness
+
+---
+
+## Related Documents
+
+- `work-summary/2025-01-policy-ordering-plan.md` - Implementation plan
+- `work-summary/FIFO-ORDERING-STATUS.md` - Overall status
+- `crates/executor/src/queue_manager.rs` - Queue manager implementation
+- `crates/executor/tests/fifo_ordering_integration_test.rs` - Test suite