URL: https://github.com/SSSD/sssd/pull/947
Title: #947: tests: fix race conditions in integration tests

alexey-tikhonov commented:
"""
> about the race between adding e.g. the user to /etc/passwd and getting 
> inotify processed.
> 
> Isn't this similar to why calling `sss_cache` was added `useradd` and other 
> utilities from the shadow-utils package? Have you tried if instead of 
> increasing the delay calling `sss_cache -E` would work as well?

If i understand correctly `sss_cache` will reset mem-cache and re-write 
timestamps in sysdb cache but that's not enough because files_provider ignores 
timestamps in sysdb cache. So if inotify event have not been processed yet then 
files_provider still will return stale data from sysdb cache. I wrote [about 
it](https://bugzilla.redhat.com/show_bug.cgi?id=1693379#c6) (item 2) )

> I think whenever a cache is added in between this use case can only be 
> covered if the cache is explicitly invalidated after adding the new line

This is true in the limits of current design of files_provider.

But the problem is there are no "ready" means to invalidate sysdb cache for 
files_provider as it ignores timestamp (again, if I understand correctly)

To this extent I agree with @pbrezina that if case is expected to test current 
design then `sleep` is ok.

"""

See the full comment at 
https://github.com/SSSD/sssd/pull/947#issuecomment-561645860
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