Test Coverage

This one automates the grind of hitting 80% line coverage for Flows apps. It doesn't just run a report and leave you hanging. It configures Vitest or Jest coverage tooling if it's missing, audits your exclude rules to catch overly broad exemptions (like hiding entire component or page directories), then writes the actual missing test files for hooks, services, and utilities. It knows to use renderHook with QueryClientProvider wrappers for React hooks and vi.mock for services. If tests are broken, it fixes imports and mocks before measuring coverage. Useful when you're staring at a 60% coverage gate failure and need to close the gap without spending half a day figuring out which files have no tests.

Install to Claude Code

npx -y skills add cognitedata/builder-skills --skill test-coverage --agent claude-code