The developer fixed a failure, but the auto-tests in the pipeline are red. How to see where the error is?

To understand where the error is in a pipeline with red autotests, you need to:

1. Open the execution logs of the pipeline in the CI/CD system (e.g., Jenkins, GitLab CI, GitHub Actions).
2. Find the specific step where the tests failed — usually, there is a detailed error output there.
3. Look at the stack trace and error messages to understand which test failed and why.
4. If the tests are automated, you can run them locally with the same parameters to reproduce the error.
5. Check for code changes that might have affected the tests — perhaps fixing the failure introduced a regression.

Thus, analyzing logs and reproducing tests locally will help quickly localize the problem.