Test Generator

Official Pro

Generate vitest/jest tests for a file: happy path, edges, failure modes

Vector1 installs

What it does

Given a source file (TypeScript/JavaScript), generates a vitest or jest test suite covering happy paths, edge cases, and failure modes. Understands your existing test patterns and matches them (imports, mocks, assertion style). Flags code that's hard to test and suggests why.

Why you need it

"Ask AI to write tests" usually produces happy-path-only tests that check what the code already does. This skill writes the tests that catch real bugs — boundary conditions, null handling, error paths, race conditions.

Key capabilities

- Happy path + edge + failure coverage - Matches project test style (imports, mocks, fixtures) - Detects untestable code and says why - Property-based test suggestions for pure functions - Mock boundaries, not everything