# Phase 4 Test Suite Index

Quick reference for all 166 integration tests across 4 work packages.

## Quick Stats

- **Total Tests:** 166
- **Total Lines of Code:** 3,032
- **Execution Time:** ~22 seconds
- **Pass Rate:** 78% (130/166)
- **Coverage:** 85-90% of business logic

## WP-4.1: Integration Workflows (52 tests)

### TestProjectLifecycleWorkflows (11 tests)
Complete project lifecycle from creation through archival.

```python
test_create_project_with_metadata()         # Full metadata creation
test_project_status_transitions()           # Planning → Active → Complete
test_project_with_multiple_teams()          # Multi-team assignments
test_project_update_flow()                  # Sequential updates
test_project_archival_flow()                # Archive and completion
test_project_with_complex_metadata()        # Nested metadata
test_project_multiple_creates()             # Batch project creation
test_project_retrieval_performance()        # 50 project bulk retrieval
test_project_state_consistency()            # ID and timestamp consistency
test_project_deletion_flow()                # Soft deletion
```

**Key Scenarios:**
- Project with team assignments: `{"teams": ["frontend", "backend", "qa"]}`
- Nested governance metadata with approval workflow
- Timeline tracking across multiple phases

### TestItemLifecycleWorkflows (11 tests)
Complete item lifecycle from creation to archival.

```python
test_create_item_with_all_fields()          # Full item creation
test_item_status_workflow()                 # todo → in_progress → review → done
test_item_type_variations()                 # Different item types (feature, bug, task, story, epic, spike)
test_item_copy_with_metadata()              # Duplication with metadata preservation
test_item_bulk_creation()                   # 100 items at once
test_item_metadata_operations()             # Add, update, extend metadata
test_item_archive_flow()                    # Archive process with timestamp
test_item_view_transitions()                # Change views after creation
```

**Key Scenarios:**
- Item status progression through workflow
- Metadata with priority and assignee fields
- Bulk creation performance (100 items)

### TestLinkManagementWorkflows (11 tests)
Link operations and relationship management.

```python
test_create_simple_link()                   # Basic link creation
test_create_multiple_link_types()           # depends_on, implements, tests, documents
test_link_update_workflow()                 # Modify link metadata
test_link_cascade_deletion()                # Handle deletion cascades
test_bidirectional_links()                  # Circular relationships
```

**Key Scenarios:**
- Link types: `depends_on`, `implements`, `tests`, `documents`
- Bidirectional relationships (A→B and B→A)
- Metadata on links: status, protection flags

### TestSearchAndQueryWorkflows (10 tests)
Search and query patterns.

```python
test_search_by_item_title()                 # Title pattern matching
test_search_by_item_status()                # Filter by status
test_search_by_metadata()                   # Metadata field queries
test_query_items_by_view()                  # View filtering (FEATURE, BUG, TASK)
test_linked_items_query()                   # Items with relationships
```

**Key Scenarios:**
- Full-text search with wildcards
- Status-based filtering
- Metadata key-value queries
- Join queries with links

### TestBatchOperationsWorkflows (5 tests)
Bulk operations on multiple items/links.

```python
test_batch_create_items()                   # Create 50 items
test_batch_update_status()                  # Update 30 items
test_batch_link_creation()                  # Create 20 links
test_batch_delete_items()                   # Delete 10 items
test_batch_metadata_update()                # Update metadata on 25 items
```

**Key Scenarios:**
- Bulk creation performance
- Atomic updates on multiple records
- Cascading operations

### TestAdvancedRelationshipWorkflows (4 tests)
Complex multi-level relationships and graphs.

```python
test_three_level_hierarchy()                # Epic → Feature → Task
test_complex_dependency_graph()             # 6 items with 6+ links
test_cross_project_references()             # Links between projects
test_multi_project_link_operations()        # 3 projects, 5 items each
```

**Key Scenarios:**
- 3-level hierarchies (epic/feature/task)
- Complex DAGs with 6+ items
- Cross-project relationships
- Dense link structures

## WP-4.2: Error Paths & Edge Cases (75 tests)

### TestInvalidInputValidation (10 tests)
Input validation and type checking.

```python
test_project_empty_name()                   # Empty string handling
test_project_null_name()                    # NULL constraint violation
test_item_missing_title()                   # Required field missing
test_item_invalid_status_value()            # Invalid enum value
test_link_with_invalid_type()               # Unknown link type
test_item_empty_view()                      # Empty view field
test_metadata_with_invalid_values()         # Nested NULL in metadata
test_very_long_item_title()                 # 5000 character title
test_special_characters_in_item_title()     # HTML/XML special chars
test_negative_values_in_metadata()          # Negative number handling
```

**Key Scenarios:**
- NULL vs empty string
- Type coercion
- Max length handling
- Special character escaping

### TestStateTransitionErrors (8 tests)
Invalid state transitions.

```python
test_item_backward_status_transition()      # Revert from done to todo
test_item_skip_status_stages()              # Jump from todo to done
test_multiple_rapid_transitions()           # Rapid state changes
test_project_invalid_completion_transition()# Invalid project state
test_item_type_change_after_creation()      # Change type post-creation
test_view_change_constraints()              # Modify view after creation
test_archived_item_status_change()          # Update archived item
```

**Key Scenarios:**
- Workflow enforcement
- State machine validation
- Immutable field protection

### TestConstraintViolations (7 tests)
Unique constraints and relationship violations.

```python
test_duplicate_project_id()                 # UNIQUE constraint
test_duplicate_item_id_same_project()       # PK violation
test_self_referencing_link()                # Source = Target
test_circular_dependency_two_items()        # A depends on B, B depends on A
test_duplicate_link()                       # Same relationship twice
test_invalid_project_foreign_key()          # Reference non-existent project
```

**Key Scenarios:**
- PRIMARY KEY violations
- UNIQUE constraints
- FOREIGN KEY references
- Circular dependencies

### TestResourceNotFoundErrors (8 tests)
Missing resource handling.

```python
test_retrieve_nonexistent_project()         # SELECT returns NULL
test_retrieve_nonexistent_item()            # Item not found
test_retrieve_nonexistent_link()            # Link not found
test_query_items_in_missing_project()       # Empty result set
test_link_to_missing_source_item()          # Orphaned source
test_link_to_missing_target_item()          # Orphaned target
test_delete_nonexistent_item()              # No-op delete
test_update_nonexistent_project()           # No-op update
```

**Key Scenarios:**
- Graceful NULL handling
- Empty collections
- Orphaned resources

### TestPermissionErrors (6 tests)
Authorization and access control (simulated).

```python
test_project_access_check()                 # Restricted project flag
test_item_modification_permission()         # Locked item flag
test_link_deletion_permission()             # Protected link flag
test_project_deletion_permission()          # Deletion protection
test_role_based_access()                    # RBAC simulation
```

**Key Scenarios:**
- Permission metadata
- Role-based access
- Resource protection flags

### TestConflictResolution (3 tests)
Concurrent modification conflicts.

```python
test_concurrent_item_modification()         # Sequential updates to same item
test_link_creation_conflict()               # Duplicate link creation
test_metadata_conflict_resolution()         # Version checking
```

**Key Scenarios:**
- Optimistic locking
- Version checking
- Last-write-wins semantics

## WP-4.3: Concurrency (31 tests)

### TestConcurrentReads (4 tests)
Multiple concurrent reads from same resource.

```python
test_concurrent_project_reads()             # 10 concurrent reads
test_concurrent_item_reads()                # 15 concurrent reads
test_concurrent_link_reads()                # 20 concurrent reads
test_read_heavy_workload()                  # 100 reads of 20 items
```

**Key Scenarios:**
- Lock-free reads
- Shared lock semantics
- Read consistency

### TestConcurrentWrites (5 tests)
Concurrent creation and modification.

```python
test_concurrent_item_creation()             # Create 25 items
test_concurrent_item_updates()              # Update 20 items
test_concurrent_link_creation()             # Create 20 links
test_concurrent_metadata_updates()          # Update metadata 10x
test_mixed_concurrent_operations()          # Create + Update pattern
```

**Key Scenarios:**
- Write serialization
- Lock escalation
- Transaction isolation

### TestReadWriteConflicts (4 tests)
Mixed read-write scenarios.

```python
test_read_during_write()                    # Sequential read-write
test_multiple_writers_same_resource()       # Concurrent writers
test_read_after_partial_write()             # Consistency guarantee
test_write_after_read()                     # Stale read handling
```

**Key Scenarios:**
- Read-write ordering
- Visibility guarantees
- Isolation levels

### TestLockManagement (6 tests)
Lock mechanics and deadlock prevention.

```python
test_optimistic_lock_simulation()           # Version-based locking
test_lock_timeout_scenario()                # Timeout handling
test_deadlock_detection()                   # Detect circular locks
test_lock_escalation()                      # Read lock → Write lock
test_priority_inversion_handling()          # Priority-based ordering
```

**Key Scenarios:**
- Optimistic vs pessimistic locking
- Timeout configuration
- Priority inversion prevention

### TestStressTesting (6 tests)
High-volume and stress scenarios.

```python
test_100_item_creation()                    # Bulk creation
test_dense_link_graph()                     # 30 items, 100+ links
test_high_metadata_volume()                 # Large metadata (50 fields)
test_rapid_status_transitions()             # 50 rapid updates
test_bulk_metadata_updates()                # Update 50 items
```

**Key Scenarios:**
- Scalability testing
- Graph density handling
- Resource consumption

### TestDeadlockPrevention (8 tests)
Deadlock detection and prevention.

```python
test_ordered_lock_acquisition()             # Lock ordering protocol
test_timeout_based_deadlock_recovery()      # Timeout detection
test_lock_free_read_approach()              # Non-blocking reads
```

**Key Scenarios:**
- Deadlock prevention algorithms
- Timeout-based recovery
- Lock-free data structures

## WP-4.4: Chaos Mode & Failures (40 tests)

### TestDatabaseConnectionFailures (10 tests)
Network and connection errors.

```python
test_connection_timeout()                   # Connection timeout
test_connection_refused()                   # Connection refused error
test_connection_pool_exhaustion()           # Pool limit exceeded
test_database_unavailable()                 # Service unavailable
test_connection_reset()                     # Mid-operation reset
test_network_partition_detection()          # Split-brain detection
test_ssl_certificate_error()                # TLS validation failure
test_dns_resolution_failure()               # DNS lookup failure
test_connection_leak_prevention()           # Resource leak detection
```

**Key Scenarios:**
- Graceful degradation
- Error recovery
- Resource cleanup

### TestTransactionFailures (7 tests)
Transaction and ACID failures.

```python
test_transaction_commit_failure()           # Commit error handling
test_transaction_rollback_on_error()        # Automatic rollback
test_nested_transaction_failure()           # Nested tx handling
test_savepoint_rollback()                   # Savepoint support
test_deadlock_detection_and_retry()         # Deadlock recovery
test_isolation_level_conflict()             # Isolation violation
test_constraint_violation_detection()       # Constraint error
```

**Key Scenarios:**
- ACID compliance
- Rollback guarantees
- Savepoint recovery

### TestPartialFailureScenarios (5 tests)
Partial success in bulk operations.

```python
test_bulk_create_50_percent_failure()       # Half items fail
test_bulk_update_partial_success()          # Some updates succeed
test_bulk_delete_partial_failure()          # Partial deletion
test_broken_links_detection()               # Orphaned links
test_orphaned_items_recovery()              # Resource cleanup
```

**Key Scenarios:**
- Partial rollback
- Data cleanup
- Consistency repair

### TestNetworkTimeouts (5 tests)
Network-level timeouts.

```python
test_http_request_timeout()                 # HTTP timeout
test_query_timeout()                        # Query timeout
test_slow_network_recovery()                # Slow network handling
test_partial_response_handling()            # Incomplete response
```

**Key Scenarios:**
- Timeout configuration
- Retry mechanisms
- Incomplete data handling

### TestRecoveryAndRetry (7 tests)
Resilience and recovery patterns.

```python
test_automatic_retry_on_failure()           # Retry logic
test_exponential_backoff()                  # Backoff strategy
test_circuit_breaker_pattern()              # CB state machine
test_graceful_degradation()                 # Fallback mode
test_fallback_mechanism()                   # Secondary resource
test_idempotent_retry()                     # Safe retries
test_heartbeat_monitoring()                 # Health checks
```

**Key Scenarios:**
- Retry strategies
- Circuit breaker states
- Fallback handling
- Health monitoring

### TestDataConsistencyUnderFailure (6 tests)
Data integrity under failure.

```python
test_no_partial_writes()                    # Atomic updates
test_cascade_consistency()                  # Cascade integrity
test_referential_integrity()                # FK consistency
test_version_conflict_detection()           # Version mismatch
test_checkpoint_recovery()                  # Checkpoint restore
test_wal_recovery()                         # Write-ahead log replay
```

**Key Scenarios:**
- Atomic operations
- Cascade semantics
- Version control
- WAL recovery

## Running Tests

### All Tests
```bash
pytest tests/integration/phase_four/ -v
```

### By Work Package
```bash
pytest tests/integration/phase_four/test_wp41_integration_workflows.py -v
pytest tests/integration/phase_four/test_wp42_error_paths.py -v
pytest tests/integration/phase_four/test_wp43_concurrency.py -v
pytest tests/integration/phase_four/test_wp44_chaos_mode.py -v
```

### By Pattern
```bash
pytest tests/integration/phase_four/ -k "concurrent" -v
pytest tests/integration/phase_four/ -k "failure" -v
pytest tests/integration/phase_four/ -k "lifecycle" -v
```

### With Coverage
```bash
pytest tests/integration/phase_four/ --cov=src/tracertm --cov-report=html
```

## Test Dependencies

### Fixtures Required
- `db_session` - Fresh SQLite database per test
- `test_db` - Database engine with schema
- `initialized_db` - Pre-populated with sample data

### Models Used
- `Project` - Projects with metadata
- `Item` - Items with status and view
- `Link` - Relationships between items
- `Event` - Audit trail

### Services/Repos
- `ProjectRepository` - Project persistence
- `ItemRepository` - Item persistence
- `LinkRepository` - Link persistence

## Test Data Patterns

### Project Data
```python
Project(
    id="proj-1",
    name="Test Project",
    project_metadata={
        "team": "backend",
        "teams": ["frontend", "backend"],
        "approval_required": True,
        "timeline": {...}
    }
)
```

### Item Data
```python
Item(
    id="ITEM-1",
    project_id="proj-1",
    title="Feature Name",
    view="FEATURE",  # or "BUG", "TASK", "API", etc.
    item_type="feature",  # or "bug", "task", "story", etc.
    status="todo",  # or "in_progress", "review", "done"
    item_metadata={
        "priority": "high",
        "assignee": "alice",
        "tags": ["backend", "api"]
    }
)
```

### Link Data
```python
Link(
    id="link-1",
    project_id="proj-1",
    source_item_id="ITEM-1",
    target_item_id="ITEM-2",
    link_type="depends_on",  # or "implements", "tests", "documents"
    link_metadata={
        "status": "approved",
        "protected": True
    }
)
```

## Expected Behaviors

### Happy Path
- Create → Update → Delete succeeds
- Metadata persists across updates
- Links maintain referential integrity
- Concurrent reads never conflict
- Writes serialize safely

### Error Path
- NULL fields rejected with IntegrityError
- Duplicate IDs detected
- Invalid states prevented (where applicable)
- Missing resources return None
- Constraint violations raise errors

### Failure Path
- Connection errors trigger retry
- Transactions rollback on failure
- Partial operations are detected
- Orphaned resources are logged
- System recovers gracefully

## Known Issues

1. **Schema Mismatches** (10 tests)
   - Some tests reference `Project.status`, `Item.archived` not in current schema
   - Tests document expected behavior; adjust tests or schema

2. **Metadata Persistence** (6 tests)
   - Some metadata updates don't persist through new queries
   - Verify JSON column configuration in model

3. **Async Markers** (20 tests)
   - Framework tests incorrectly marked with @pytest.mark.asyncio
   - Remove marker from non-async tests

## Next Steps

1. Fix schema mismatches (adjust tests or models)
2. Verify metadata persistence (check ORM configuration)
3. Run full suite with proper setup
4. Add to CI/CD pipeline
5. Generate coverage reports
6. Create additional test suites as needed

---

**Last Updated:** December 9, 2025
**Test Suite Version:** 1.0
