🧪 Ship code with proof it works.
Paste a function, get meaningful unit tests — happy path, edge cases, failure modes, mocks included. For Jest, Pytest, PHPUnit and more.
✓ Free forever✓ No signup✓ AI brain + local proof
AI-generated — always review before shipping to production. Your input is sent to the AI service only to generate the answer. The 85 classic utilities on this site run 100% in your browser.
How it works
- Paste the function: Drop in the function or module you want covered by tests.
- Pick the framework and language: Select your test framework (Jest, pytest, and others) and language so the output plugs straight into your suite.
- Get the tests: The instrument generates test cases covering the main paths plus edge cases, ready to paste into your project.
Good to know
- Generated tests assert what the code currently does — verify the assertions encode the behavior you actually want.
- Aim coverage at critical logic first; 100% coverage of trivial getters adds maintenance cost without safety.