test-coverage-improve

To improve TypeScript test coverage to 80% or higher, run automated coverage analysis using Jest with the coverage flag to identify gaps in critical modules like utilities, services, and API handlers. You then implement targeted unit and integration tests to close those gaps.

The best way to structure unit tests for JavaScript services and API handlers is using the AAA pattern. This isolates components with repository mocks and incorporates Spanish business context data to ensure robust edge-case coverage and reliable refactoring.

Yes, you can use Jest mocking to isolate integration tests for Next.js API routes. By applying repository mocks, you enforce proper isolation and clear success criteria for testing critical modules within your JavaScript and TypeScript codebase.

Your npm test coverage report shows gaps in utility and service modules because they lack targeted unit and integration tests. Identifying these uncovered areas allows you to apply structured testing patterns and elevate overall codebase reliability.

You need repository mocks for TypeScript unit tests when isolating critical modules like services and API handlers. Mocking ensures tests remain independent, validates business logic without external dependencies, and helps achieve comprehensive edge-case coverage.