John Mullin wrote:
> I ran "make test" after patch 7.1.130 and it failed test61 with the
> following diff...
>
> ../vim -u unix.vim -U NONE --noplugin -s dotest.in test61.in
> 20c20
> < 23456789
> ---
> > 123456789
>
> I reran the test a few times and noticed that resizing the urxvt terminal
> during the test caused the test to fail more often.
>
> I re-ran "make test61.out" in a loop (removing the out file each time)
> with the terminal window minimised and it failed one test (loop 47) in 130
> loops. The failure had the following error.
>
> ../vim -u unix.vim -U NONE --noplugin -s dotest.in test61.in
> 20c20
> < 3456789
> ---
> Tests for undo tree.
> Tests for undo tree.
> > 123456789
>
> I reversed patch 7.1.130 and I ran the loop (minimised), it failed on loop
> 246 of 264 with the following diff...
>
> ../vim -u unix.vim -U NONE --noplugin -s dotest.in test61.in
> 20c20
> < 23456789
> ---
> Tests for undo tree.
> > 123456789
>
>
> I don't know if this is a genuine failure of some race or mistake in
> the test.
It's a race condition. The test checks if jumping back in time works
for undo. This is inherently tricky, especially on a slow system or
when something else takes away CPU time. I did manage to make it mostly
work, but it may still fail once in a while.
If it works more than 50% of the time it should be OK.
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