gridpilot.gg/tests/integration/leaderboards/README.md

# Leaderboards Integration Tests

This directory contains integration test placeholders for the leaderboards functionality in GridPilot, following the Clean Integration Testing strategy.

## Test Coverage

### 1. Global Leaderboards Use Cases (`global-leaderboards-use-cases.integration.test.ts`)
Tests the orchestration logic for the main leaderboards page use cases:
- **Use Case**: `GetGlobalLeaderboardsUseCase`
- **Purpose**: Retrieves top drivers and teams for the global leaderboards page
- **Focus**: Verifies Use Case orchestration with In-Memory adapters

**Key Scenarios:**
- ✅ Retrieve top drivers and teams with complete data
- ✅ Handle minimal data scenarios
- ✅ Limit results to top 10 drivers and teams
- ✅ Handle empty states (no drivers, no teams, no data)
- ✅ Handle duplicate ratings with consistent ordering
- ✅ Verify data accuracy and ranking consistency
- ✅ Error handling for repository failures

### 2. Driver Rankings Use Cases (`driver-rankings-use-cases.integration.test.ts`)
Tests the orchestration logic for the detailed driver rankings page:
- **Use Case**: `GetDriverRankingsUseCase`
- **Purpose**: Retrieves comprehensive list of all drivers with search, filter, and sort capabilities
- **Focus**: Verifies Use Case orchestration with In-Memory adapters

**Key Scenarios:**
- ✅ Retrieve all drivers with complete data
- ✅ Pagination with various page sizes
- ✅ Search functionality (by name, partial match, case-insensitive)
- ✅ Filter functionality (by rating range, team affiliation)
- ✅ Sort functionality (by rating, name, rank, race count)
- ✅ Combined search, filter, and sort operations
- ✅ Empty states and edge cases
- ✅ Error handling for repository failures

### 3. Team Rankings Use Cases (`team-rankings-use-cases.integration.test.ts`)
Tests the orchestration logic for the detailed team rankings page:
- **Use Case**: `GetTeamRankingsUseCase`
- **Purpose**: Retrieves comprehensive list of all teams with search, filter, and sort capabilities
- **Focus**: Verifies Use Case orchestration with In-Memory adapters

**Key Scenarios:**
- ✅ Retrieve all teams with complete data
- ✅ Pagination with various page sizes
- ✅ Search functionality (by name, partial match, case-insensitive)
- ✅ Filter functionality (by rating range, member count)
- ✅ Sort functionality (by rating, name, rank, member count)
- ✅ Combined search, filter, and sort operations
- ✅ Member count aggregation from drivers
- ✅ Empty states and edge cases
- ✅ Error handling for repository failures

## Test Structure

Each test file follows the same pattern:

```typescript
describe('Use Case Orchestration', () => {
  let repositories: InMemoryAdapters;
  let useCase: UseCase;
  let eventPublisher: InMemoryEventPublisher;

  beforeAll(() => {
    // Initialize In-Memory adapters
  });

  beforeEach(() => {
    // Clear repositories before each test
  });

  describe('Success Path', () => {
    // Tests for successful operations
  });

  describe('Search/Filter/Sort Functionality', () => {
    // Tests for query operations
  });

  describe('Edge Cases', () => {
    // Tests for boundary conditions
  });

  describe('Error Handling', () => {
    // Tests for error scenarios
  });

  describe('Data Orchestration', () => {
    // Tests for business logic verification
  });
});
```

## Testing Philosophy

These tests follow the Clean Integration Testing strategy:

### What They Test
- **Use Case Orchestration**: How Use Cases interact with their Ports (Repositories, Event Publishers)
- **Business Logic**: The core logic of ranking, filtering, and sorting
- **Data Flow**: How data moves through the Use Case layer
- **Event Emission**: Whether proper events are published

### What They DON'T Test
- ❌ UI rendering or visual implementation
- ❌ Database persistence (use In-Memory adapters)
- ❌ API endpoints or HTTP contracts
- ❌ Real external services
- ❌ Performance benchmarks

### In-Memory Adapters
All tests use In-Memory adapters for:
- **Speed**: Tests run in milliseconds
- **Determinism**: No external state or network issues
- **Focus**: Tests orchestration, not infrastructure

## Running Tests

```bash
# Run all leaderboards integration tests
npx vitest run tests/integration/leaderboards/

# Run specific test file
npx vitest run tests/integration/leaderboards/global-leaderboards-use-cases.integration.test.ts

# Run with UI
npx vitest ui tests/integration/leaderboards/

# Run in watch mode
npx vitest watch tests/integration/leaderboards/
```

## Implementation Notes

### TODO Comments
Each test file contains TODO comments indicating what needs to be implemented:
1. **Setup**: Initialize In-Memory repositories and event publisher
2. **Clear**: Clear repositories before each test
3. **Test Logic**: Implement the actual test scenarios

### Test Data Requirements
When implementing these tests, you'll need to create test data for:
- Drivers with various ratings, names, and team affiliations
- Teams with various ratings and member counts
- Race results for statistics calculation
- Career history for profile completeness

### Expected Use Cases
These tests expect the following Use Cases to exist:
- `GetGlobalLeaderboardsUseCase`
- `GetDriverRankingsUseCase`
- `GetTeamRankingsUseCase`

And the following Ports:
- `GlobalLeaderboardsQuery`
- `DriverRankingsQuery`
- `TeamRankingsQuery`

### Expected Adapters
These tests expect the following In-Memory adapters:
- `InMemoryDriverRepository`
- `InMemoryTeamRepository`
- `InMemoryEventPublisher`

## Related Files

- [`plans/clean_integration_strategy.md`](../../../plans/clean_integration_strategy.md) - Clean Integration Testing philosophy
- [`tests/e2e/bdd/leaderboards/`](../../e2e/bdd/leaderboards/) - BDD E2E tests for user outcomes
- [`tests/integration/drivers/`](../drivers/) - Example integration tests for driver functionality

## Next Steps

1. **Implement In-Memory Adapters**: Create the In-Memory versions of repositories and event publisher
2. **Create Use Cases**: Implement the Use Cases that these tests validate
3. **Define Ports**: Define the Query and Port interfaces
4. **Implement Test Logic**: Replace TODO comments with actual test implementations
5. **Run Tests**: Verify all tests pass and provide meaningful feedback