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bug#23205: 25.0.92; sort-tests is flaky

From: Philipp Stephani
Subject: bug#23205: 25.0.92; sort-tests is flaky
Date: Sun, 03 Apr 2016 21:00:50 +0000

On Sun, Apr 3, 2016 at 4:58 PM Eli Zaretskii <address@hidden> wrote:
> From: Philipp Stephani <address@hidden>
> Date: Sun, 03 Apr 2016 10:30:10 +0000
> In the emacs-25 branch, in the directory test/automated, run:
> declare -i failures=0
> for ((i=0; i<1000; i++)); do
> if ! output="$(make sort-tests 2>&1)"; then
> ((failures++))
> echo "Iteration $i: $output"
> fi
> done
> echo "Failures: $failures"
> There will be typically a small number of failures (< 10), caused by
> e.g.
> Test sort-tests--lines condition:
> (ert-test-failed
> ((should
> (string=
> (substring ... 0 -1)
> sorted-words))
> :form
> (string= "Zi
> zI" "zI
> Zi")
> :value nil))
> This is presumably due to non-stable sorting. Either the sorting should
> be made stable, or the test shouldn't assume stable sorting.

Do you sometimes see such failures if you just run the test once?

I don't know, what's the difference between running it once and running it 1000 times? Since it fails randomly, it could fail in any iteration, including the first one. 

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