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Story 2.7: Test Backend Service Layer

As a developer, I want unit tests for backend service business logic, So that service-layer bugs are caught without network or database dependencies.

FRs: FR10 | Sprint: 22

Acceptance Criteria:

  • __tests__/services/query-service.test.js tests query construction and formatting logic
  • __tests__/services/chat-history-service.test.js tests conversation/message CRUD operations
  • __tests__/services/analytics-service.test.js tests analytics data aggregation
  • __tests__/services/user-profile-service.test.js tests profile retrieval and update logic
  • __tests__/services/translation-service.test.js tests translation request handling
  • ArangoDB and external services are mocked via jest.mock()
  • All tests are independent of execution order (NFR7)