Fix flaky test.

[qwandor]

FD 3 might not be used already.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.03%. Comparing base (8299941) to head (a5ae0bd).
⚠️ Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   42.96%   42.03%   -0.93%     
==========================================
  Files           3        3              
  Lines         775      804      +29     
==========================================
+ Hits          333      338       +5     
- Misses        442      466      +24     

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[kpcyrd]

hi! any chance this could get merged? :) the test failure also got flagged by the Debian Rust tooling.

[qwandor]

I'm not sure that this actually consistently helps. The issue here seems to be that GitHub Actions runner sometimes has extra file descriptors open. In what environment are you running tests for Debian? And does this patch consistently fix the issue for you?

[kpcyrd]

Applying the patches did not help unfortunately, tests are executed by autopkgtests in sbuild (I'm not that familiar with internals of that setup), I worked around this by disabling autopkgtests for this package: https://packages.debian.org/sid/librust-command-fds-dev