ai-test-gen

Point it at your source files and it writes unit tests for you. Supports Jest, Vitest, and Mocha.

Install

npm install -g ai-test-gen

Setup

export OPENAI_API_KEY=sk-your-key-here

Usage

# Generate Jest tests for a file
npx ai-test-gen src/utils.ts --framework jest

# Vitest instead
npx ai-test-gen src/utils.ts --framework vitest

# Multiple files
npx ai-test-gen "src/**/*.ts" --framework jest

# Save to a file
npx ai-test-gen src/utils.ts --framework jest -o src/__tests__/utils.test.ts

What you get

Actual test files with imports, describe blocks, and test cases. It covers happy paths, edge cases, and error handling. You'll probably want to tweak them a bit, but it beats starting from scratch.

Heads up

The generated tests are a starting point. They won't know about your mocks, test utilities, or specific setup. But they'll get you 80% there, which is the annoying part anyway.