Generate unit tests for a function
Paste a function and get a thorough test suite — happy path, edge cases and error paths — in your framework, ready to run.
Most bugs hide in the cases nobody tested: the empty array, the null input, the off-by-one boundary, the error that should have been thrown but was swallowed. Writing those tests is exactly the tedious work engineers skip when they are busy.
This tool reads your function and generates a test suite that covers the happy path plus the edge and error cases that actually catch bugs, written in your framework (Jest, pytest, JUnit, etc.). You review the assertions and run them; you get coverage without spending an afternoon enumerating cases by hand.
The tool for this
🧪Unit Test Generator
Generate a thorough unit-test suite — happy path, edge cases and error paths.
Frequently asked questions
What test framework does it use? +
Whatever you specify — Jest, Vitest, pytest, JUnit, Go testing and more. It writes idiomatic tests for that framework.
Does it cover edge cases? +
Yes — that is the point. It includes empty inputs, nulls, boundaries and error paths, not just the happy path.
Should I review the tests? +
Yes. Confirm the assertions match intended behavior; generated tests can encode a wrong assumption if the spec is ambiguous.
Related tools
🔬Code Review
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🧩Legacy Code Explainer
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🐞Error Root-Cause Finder
Paste an error or stack trace and get the root cause, ranked fixes and prevention.
Browse the full tools directory, or see all Panshi services.