testing

Testing Best Practices and Guidelines

General Testing

• Write tests for all components
• Test user interactions
• Test edge cases
• Test error scenarios
• Test accessibility
• Use proper test data
• Keep tests maintainable

Unit Testing

• Test individual functions
• Mock external dependencies
• Test return values
• Test error handling
• Use descriptive test names
• Keep tests focused
• Test both happy and sad paths

Integration Testing

• Test component interactions
• Test API endpoints
• Test database operations
• Test authentication flows
• Test payment processing
• Test webhook handling
• Test third-party integrations

Payment Provider Testing

• ALWAYS test complete data flow: Provider API → Import → Database → Service → UI
• Create debug scripts for each provider (e.g., debug-{provider}-api-test.ts)
• Test with real provider data, not just mock data
• Verify field mapping between provider responses and database storage
• Test admin UI displays correctly after import
• Validate backward compatibility with existing payment data
• Test error scenarios (API failures, invalid data, network issues)
• Example debug script pattern:

  // debug-polar-import-test.ts
  const importStats = await polarProvider.importPayments();
  const payments = await PaymentService.getUsersWithPayments();
  console.log("Import stats:", importStats);
  console.log("Sample payment data:", payments[0]);
  // Verify orderId is populated correctly
  

E2E Testing

• Test complete user journeys
• Test across different browsers
• Test mobile responsiveness
• Test performance scenarios
• Test accessibility compliance
• Use realistic test data
• Test production-like environment

API Testing

• Test all endpoints
• Test request/response formats
• Test authentication
• Test rate limiting
• Test error responses
• Test data validation
• Test performance

Database Testing

• Test CRUD operations
• Test data integrity
• Test migrations
• Test performance
• Test concurrency
• Test backup/restore
• Test security constraints