Files used in unit tests remain in `/tmp`

[abetomo]

Describe the bug

After rake test, the following files remained in /tmp.

• /tmp/SERVERENGINE_SOCKETMANAGER_*
• /tmp/fluentd-lock-*
• /tmp/fluent/

To Reproduce

1. rake test
2. ls /tmp

Expected behavior

Files created by tests should be deleted.

Your Environment

- Fluentd version: 1.15.3
- Operating system: Ubuntu 22.04
- Kernel version: 5.15.0-58-generic

Your Configuration

-

Your Error Log

-

Additional context

No response

[daipom]

Thanks for your report!

I ran a few tests first, but no temporary files were left.

$ bundle exec rake test TESTOPTS="-t'SupervisorTest'"
$ bundle exec rake test TESTOPTS="-t'FileOutputTest'"

Some specific tests may be the cause.
I am concerned that it may be difficult to identify which test is the cause...

I am running all tests in my local environment now.

[abetomo]

I have been able to identify a few causes.

#4050
This fix removes several files.

[daipom]

Wow! Thanks!

I can confirm those files are left in /tmp/ after running all tests.

We might also consider the idea that since it is in /tmp/, it is not a problem if it remains to some extent.

If there is a test where we obviously forget something, it would be nice to fix it.