posix: testing an error case

[alyssawilk]

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Commit Message: Additional Description: Risk Level: Testing: Docs Changes: Release Notes: Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #Issue] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional API Considerations:]

[repokitteh-read-only[bot]]

As a reminder, PRs marked as draft will not be automatically assigned reviewers, or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/34416 was opened by alyssawilk.

see: more, trace.

[repokitteh-read-only[bot]]

CC @envoyproxy/coverage-shephards: FYI only for changes made to (test/per_file_coverage.sh). envoyproxy/coverage-shephards assignee is @RyanTheOptimist

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/34416 was opened by alyssawilk.

see: more, trace.