tests: fix periodic false failure in month alignment

* tests/ls/abmon-align.sh: Base relative month adjustment
from the middle of the month, to avoid failures due
to months being repeated.
Fixes https://bugs.gnu.org/31644

diff --git a/tests/ls/abmon-align.sh b/tests/ls/abmon-align.sh
index d4ff7087365f740d99b828e2d763e0ac80f699a6..79be1bae5dee55488f21cc69e282206e84ced144 100755 (executable)
--- a/tests/ls/abmon-align.sh
+++ b/tests/ls/abmon-align.sh
@@ -19,8 +19,9 @@
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ ls
 
+mid_month="$(date +%Y-%m-15)" || framework_failure_
 for mon in $(seq -w 12); do
-    touch -d"+$mon month" $mon.ts || framework_failure_
+    touch -d"$mid_month +$mon month" $mon.ts || framework_failure_
 done