What is going on
Codex reports that all tests pass. You open the app, follow the steps a real user would, and the feature fails.
Error messages you might see
Common causes
- The tests were written by the same tool that wrote the feature, so they check its assumptions and not what you wanted.
- The tests replace the database, the payment service or the network with fakes, so the real connection is never tried.
- A test checks that something runs without an error, not that the result is right.
- Your computer or the host differs from the test environment.
How to fix it
- Write down the exact steps a user takes and what should happen at the end.
- Follow them yourself in the running app and note the first step that goes wrong.
- Ask Codex to write one test that follows those same steps and make sure it fails before the fix.
- Open the tests and check what they check. A test with no real comparison proves nothing.
- Run the tests in a clean environment, such as a fresh checkout, to catch things that only work on your computer.
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Bastien Labelle
php · python · nodejs · javascript · typescript · react · nextjs · nuxt · nuxtjs · jquery · html · css · laravel · django · fastapi · wordpress · mysql · postgresql · mariadb · docker · api · fullstack · backend · frontend · webdev · mongodb · svelte · sveltejs
Full stack dev w/ 20+ years of experience
Omar Faruk
React · Laravel · Next.js · Inertia.js · Stripe · Tenstack Query
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
I played a key role in creating a scalable and maintainable platform to support educators and learners globally.
I'm enthusiastic about embracing new challenges and making meaningful contributions.
Simon A.
java · spring boot · postgres · mongodb · c# · unity · godot · react · typescript · next.js
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Questions
Should I trust tests written by Codex?
Treat them as a start. Add at least one test that follows what a real user does, and run the app yourself.
Why did the test pass before the fix?
A test that cannot fail does not test anything. Make sure each new test fails first.
