MM-47355: Added multierr for postListCmdF (#21222)

[witjem]

Summary

Adds error handling for postListCmdF. The errors are grouped with multierror.Error package and returned once the loop is done.

Ticket Link

Fixes mattermost/mattermost#21222

[mattermod]

Hello @witjem,

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[mattermod]

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[isacikgoz]

This looks good, wondering if you can update the tests as well?

[noxer]

Hi @witjem, thank you very much for your contribution. Please update the tests to check for the error. I've also got a small request for a change. Other than that it looks very good.

[witjem]

@isacikgoz

This looks good, wondering if you can update the tests as well?

I tried write test for it, but for this need mock websocket client. I can do it, but I think for this PR will be a lot changes for this issue, and maybe better create new issue for it?

[isacikgoz]

I tried write test for it, but for this need mock websocket client. I can do it, but I think for this PR will be a lot changes for this issue, and maybe better create new issue for it?

You don't need to write tests from scratch, just need to reflect the changes you made in the test file so that tests get pass. Because the function now returns an error.

[noxer]

Looks good, thank you. Updated tests would still be nice.

[mattermod]

This PR has been automatically labelled "stale" because it hasn't had recent activity.
A core team member will check in on the status of the PR to help with questions.
Thank you for your contribution!

[witjem]

@noxer Which tests I should updates? All tests is pass)

[noxer]

I meant adding tests for the new errors. I agree that in this case it might not be that easy.
LGTM

[isacikgoz]

LGTM, agreed testing can be a bit complicated. Thanks @witjem 🎉