Скачать или смотреть Resolving Segmentation Fault (Core Dumped) in Jest Tests on GitLab CI

Encountering a segmentation fault while running Jest tests on GitLab CI? Learn how to resolve the issue by avoiding certain flags during testing!
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Resolving Segmentation Fault (Core Dumped) in Jest Tests on GitLab CI

When you're working with Jest for unit testing in a TypeScript project on GitLab CI, encountering a segmentation fault can be a frustrating experience. This issue usually indicates that there is a problem with memory access, which occurs after all tests have passed. Let's dive into the scenario and explore a simple solution to resolve it.

The Problem

After executing your Jest tests using the command:

[[See Video to Reveal this Text or Code Snippet]]

you might see output indicating that the tests have successfully passed, but shortly after, you receive a Segmentation fault (core dumped) error.

For example, your output may look like this:

[[See Video to Reveal this Text or Code Snippet]]

Even though all your tests are running successfully, the job fails post-testing due to the segmentation fault.

Understanding the Cause

The segmentation fault is often related to memory issues, which can behave unexpectedly when certain Jest flags are used. Notably, the --detectOpenHandles flag is known to cause complications in CI environments like GitLab, where it attempts to look for open handles that may not be accessible.

Let's break down the context:

When Jest runs with --detectOpenHandles, it actively checks for asynchronous operations that remain open, which may not be compatible with the GitLab Runner's settings.

Memory logs before the tests show sufficient resources, so the fault is likely tied to the Jest configuration rather than resource constraints.

The Solution: Remove the Problematic Flag

To resolve this issue, follow these simple steps:

Modify Your Jest Command: Remove the --detectOpenHandles flag from your Jest command. The updated command should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Run Your Tests Again: Execute the modified command in your GitLab CI configuration. This should allow your tests to run without encountering a segmentation fault and conclude your job successfully.

Conclusion

Segmentation faults can derail your CI/CD pipeline, but thankfully, issues like these have straightforward fixes. By simply adjusting your Jest command to avoid problematic flags like --detectOpenHandles, you can ensure your tests run smoothly in GitLab CI.

If you're ever stuck with similar issues, remember to analyze your test command and consider removing or changing flags that may interact poorly with your CI environment. Happy testing!