# Test Coverage Gap Analysis & Implementation Plan

**Project**: Trace RTM  
**Date**: November 21, 2024  
**Goal**: Identify coverage gaps and create targeted test implementation plan

---

## Coverage Analysis Framework

### Module Assessment Template

For each module, assess:

1. **Current Coverage** (0-100%)
   - Statement coverage
   - Function coverage  
   - Branch coverage
   - User story coverage

2. **Gap Identification**
   - Uncovered lines
   - Untested functions
   - Unexercised branches
   - Untested scenarios

3. **Priority** (Critical/High/Medium/Low)
   - Based on module criticality
   - Risk of bugs without coverage
   - Frequency of use

4. **Effort** (hours)
   - Time to achieve 100% coverage

5. **Dependencies**
   - Other modules that must be tested first
   - External services to mock

---

## Critical Modules (100% Required)

### 1. User Operations (`src/models/user.py`, `src/services/user_service.py`)

**Importance**: Foundation of all user-facing features

**Current State**: [To be filled in]

**Coverage Gaps**:
- [ ] User model instantiation
- [ ] Email validation
- [ ] Password hashing
- [ ] User creation workflow
- [ ] User update operations
- [ ] User deletion operations
- [ ] User query operations
- [ ] Permission checking
- [ ] Role-based access

**Test Cases Needed** (20-30 tests):

```python
# Unit Tests - User Model
test_user_creation_valid()
test_user_creation_invalid_email()
test_user_creation_missing_name()
test_user_password_hashing()
test_user_password_verification()
test_user_equality()
test_user_string_representation()
test_user_to_dict()

# Unit Tests - UserService
test_create_user_success()
test_create_user_duplicate_email()
test_create_user_invalid_input()
test_get_user_by_id()
test_get_user_by_email()
test_update_user()
test_update_user_not_found()
test_delete_user()
test_delete_user_not_found()
test_list_users()
test_list_users_paginated()

# Integration Tests
test_user_persists_to_database()
test_user_retrieval_from_database()
test_user_update_in_database()
test_user_deletion_from_database()
test_user_creation_triggers_event()
```

**Priority**: CRITICAL  
**Effort**: 3-4 hours

---

### 2. Project Operations (`src/models/project.py`, `src/services/project_service.py`)

**Importance**: Core feature - all data organized by projects

**Coverage Gaps**:
- [ ] Project creation
- [ ] Project update/rename
- [ ] Project deletion
- [ ] Project querying
- [ ] Owner/member management
- [ ] Project settings
- [ ] Project status tracking
- [ ] Permission validation

**Test Cases Needed** (25-35 tests):

```python
# Unit Tests - Project Model
test_project_creation()
test_project_owner_assignment()
test_project_validation()
test_project_equality()

# Unit Tests - ProjectService
test_create_project_success()
test_create_project_duplicate_name()
test_create_project_invalid_owner()
test_get_project_by_id()
test_get_projects_by_owner()
test_update_project()
test_delete_project()
test_add_member_to_project()
test_remove_member_from_project()
test_list_project_members()
test_project_permissions()
test_project_archive()

# Integration Tests
test_project_creation_workflow()
test_project_deletion_cascade()
test_project_member_management()
test_project_events()
```

**Priority**: CRITICAL  
**Effort**: 3-4 hours

---

### 3. Link Management (`src/models/link.py`, `src/services/link_service.py`)

**Importance**: Core traceability feature

**Coverage Gaps**:
- [ ] Link creation
- [ ] Link validation (valid source/target)
- [ ] Link types (requirements, implementation, test)
- [ ] Link bidirectionality
- [ ] Link deletion
- [ ] Link querying
- [ ] Circular reference detection
- [ ] Link impact analysis

**Test Cases Needed** (20-30 tests):

```python
# Unit Tests - Link Model
test_link_creation()
test_link_validation()
test_link_types()
test_link_equality()

# Unit Tests - LinkService
test_create_link_success()
test_create_link_invalid_source()
test_create_link_invalid_target()
test_create_circular_reference()
test_delete_link()
test_get_links_by_source()
test_get_links_by_target()
test_get_all_links()
test_link_impact_analysis()
test_link_bidirectionality()

# Integration Tests
test_link_persistence()
test_link_cascade_deletion()
test_link_event_propagation()
```

**Priority**: CRITICAL  
**Effort**: 3-4 hours

---

### 4. Authentication (`src/auth/`, `src/services/auth_service.py`)

**Importance**: Security critical

**Coverage Gaps**:
- [ ] Token generation
- [ ] Token validation
- [ ] Token refresh
- [ ] JWT claims
- [ ] Permission checking
- [ ] Role validation
- [ ] Session management
- [ ] Logout/revocation
- [ ] Error handling

**Test Cases Needed** (15-25 tests):

```python
# Unit Tests
test_token_generation()
test_token_validation()
test_token_expiration()
test_token_refresh()
test_token_invalid_signature()
test_permission_check_granted()
test_permission_check_denied()
test_role_validation()

# Integration Tests
test_login_flow()
test_logout_flow()
test_token_in_request()
test_invalid_token_rejected()
test_expired_token_rejected()
```

**Priority**: CRITICAL  
**Effort**: 2-3 hours

---

### 5. Error Handling (`src/exceptions/`, `src/utils/error_handler.py`)

**Importance**: Ensures graceful failure

**Coverage Gaps**:
- [ ] All exception types
- [ ] Error messages
- [ ] Error propagation
- [ ] Error recovery
- [ ] Client error responses
- [ ] Server error responses
- [ ] Logging of errors

**Test Cases Needed** (15-20 tests):

```python
# Unit Tests
test_validation_error_raised()
test_not_found_error_raised()
test_permission_error_raised()
test_conflict_error_raised()
test_error_message_format()
test_error_logging()
test_error_response_format()

# Integration Tests
test_error_handling_in_service()
test_error_handling_in_api()
test_error_handling_in_cli()
```

**Priority**: CRITICAL  
**Effort**: 2-3 hours

---

## High Priority Modules (95%+ Required)

### 6. Services (Business Logic)

List all services:
- [ ] UserService
- [ ] ProjectService
- [ ] LinkService
- [ ] ItemService
- [ ] ViewService
- [ ] EventService
- [ ] AuthService
- [ ] NotificationService
- [ ] ReportService
- [ ] etc.

**Per Service**:
- Test all public methods
- Test error conditions
- Test state changes
- Test interactions with other services

**Effort**: 4-6 hours total

---

### 7. Repositories (Data Access)

List all repositories:
- [ ] UserRepository
- [ ] ProjectRepository
- [ ] ItemRepository
- [ ] LinkRepository
- [ ] etc.

**Per Repository**:
- Test CRUD operations
- Test queries (find_by_id, find_all, etc.)
- Test filters/sorting
- Test pagination
- Test relationships

**Effort**: 3-4 hours total

---

### 8. CLI Commands

List all commands:
- [ ] user create/update/delete/list/show
- [ ] project create/update/delete/list/show
- [ ] item create/update/delete/list/show
- [ ] link create/delete/list/show
- [ ] view render
- [ ] etc.

**Per Command**:
- Test with valid arguments
- Test with invalid arguments
- Test missing required arguments
- Test error output

**Effort**: 3-4 hours total

---

### 9. API Endpoints

List all endpoints:
- [ ] GET/POST /users
- [ ] GET/PUT/DELETE /users/{id}
- [ ] GET/POST /projects
- [ ] GET/PUT/DELETE /projects/{id}
- [ ] GET/POST /items
- [ ] GET/POST /links
- [ ] etc.

**Per Endpoint**:
- Test successful response
- Test validation errors
- Test authentication
- Test authorization
- Test edge cases

**Effort**: 3-4 hours total

---

### 10. Event Handling

**Coverage Gaps**:
- [ ] All event types
- [ ] Event publishing
- [ ] Event handling
- [ ] Event subscribers
- [ ] Error handling in events
- [ ] Async event processing

**Test Cases Needed**:
- Test each event type is published
- Test each event is handled correctly
- Test multiple subscribers
- Test failed event handling

**Effort**: 2-3 hours total

---

## Gap Analysis Summary Template

| Module | Current | Target | Gap % | Priority | Effort |
|--------|---------|--------|-------|----------|--------|
| User Operations | 60% | 100% | 40% | CRITICAL | 4h |
| Project Operations | 65% | 100% | 35% | CRITICAL | 4h |
| Link Management | 55% | 100% | 45% | CRITICAL | 4h |
| Authentication | 70% | 100% | 30% | CRITICAL | 3h |
| Error Handling | 50% | 100% | 50% | CRITICAL | 3h |
| Services | 65% | 95% | 30% | HIGH | 6h |
| Repositories | 60% | 95% | 35% | HIGH | 4h |
| CLI Commands | 55% | 95% | 40% | HIGH | 4h |
| API Endpoints | 50% | 95% | 45% | HIGH | 4h |
| Event Handling | 50% | 95% | 45% | HIGH | 3h |
| Utils/Helpers | 70% | 85% | 15% | MEDIUM | 2h |
| Configuration | 40% | 80% | 40% | MEDIUM | 2h |
| **TOTAL** | **60%** | **95%+** | **35%** | | **39h** |

---

## Implementation Phases

### Phase 1: Critical Paths (12-16 hours)
1. User Operations (4h)
2. Project Operations (4h)
3. Link Management (4h)
4. Authentication (2h)
5. Error Handling (2h)

**Result**: 95%+ coverage of critical functionality

---

### Phase 2: High Priority (17-21 hours)
1. Services (6h)
2. Repositories (4h)
3. CLI Commands (4h)
4. API Endpoints (4h)
5. Event Handling (3h)

**Result**: 90%+ coverage of standard functionality

---

### Phase 3: Special Coverage (4-6 hours)
1. Performance tests (2h)
2. Security tests (2h)
3. Integration edge cases (2h)

**Result**: Special scenario coverage

---

### Phase 4: Optimization (2-4 hours)
1. Consolidate redundant tests
2. Optimize slow tests
3. Fix flaky tests
4. Verify CI/CD enforcement

**Result**: Fast, reliable test suite

---

## Test Implementation Checklist

### For Each Module:

- [ ] Identify all classes/functions
- [ ] Create test file: `tests/unit/test_<module>.py`
- [ ] Create fixtures in conftest.py
- [ ] Create factories for test data
- [ ] Write unit tests (normal path)
- [ ] Write error/edge case tests
- [ ] Verify 100% statement coverage
- [ ] Verify 100% function coverage
- [ ] Verify 100% branch coverage
- [ ] Create integration tests
- [ ] Verify all user stories covered
- [ ] Document test patterns used

---

## Running Coverage Analysis

### Step 1: Install Tools
```bash
pip install pytest pytest-cov pytest-asyncio pytest-mock hypothesis faker factory-boy
```

### Step 2: Generate Report
```bash
# Terminal report
pytest --cov=src --cov-report=term-missing

# HTML report
pytest --cov=src --cov-report=html

# Branch coverage
pytest --cov=src --cov-branch --cov-report=term-missing
```

### Step 3: Analyze Output
- Identify uncovered lines
- Group by module
- Prioritize by importance

### Step 4: Create Gap List
- Map uncovered lines to functions
- Identify missing test cases
- Plan implementation order

---

## Success Criteria

✅ 100% Statement Coverage (every line executed)  
✅ 100% Function Coverage (every function tested)  
✅ 100% Branch Coverage (every condition tested)  
✅ 100% User Story Coverage (every requirement tested)  
✅ 95%+ Coverage in all critical modules  
✅ 85%+ Coverage in high-priority modules  
✅ Automated enforcement in CI/CD  
✅ No flaky tests  
✅ Fast execution (<30s total)

---

**Next**: Use this template to conduct detailed gap analysis and create test implementation schedule.

