Launching today

JMIT

Launching today

Finds tests that pass even when your code is broken

4 followers

Finds tests that pass even when your code is broken

4 followers

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JMIT detects zero-assertion tests, assert True patterns, and mock-only pytest functions that never catch bugs then auto-repairs them with mutation-verified replacements. 7-day free trial.

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Launch tags:Developer Tools•Tech•Vercel Day

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I built JMIT after a python project of mine with an alleged 92% coverage missed several prod bugs for weeks even though every test passed. The problem wasn't coverage, half our tests were asserting True, written as implementation instead of tests or mocking everything without ever binding to real behavior. JMIT will find these patterns (zero-assertion, assert True, mock-only tests) then verifies replacements using mutation testing: it breaks your code in small ways and confirms the new tests actually fail when they should. Happy to answer questions about how mutation verification works or how it handles large suites and would love to hear if anyone else has been burned by tests that always pass.

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1d ago