Fix parallelized test runs

Do not share a common temporary directory between different test cases.

Reported-by: Tomasz Kłoczko <kloczko.tomasz@gmail.com>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

test/ical-014.sh

@@ -4,17 +4,17 @@
 . "${TEST_INIT:-./test-init.sh}"
 
 if [ "$1" = 'actual' ]; then
-  mkdir .calcurse || exit 1
-  cp "$DATA_DIR/conf" .calcurse || exit 1
-  "$CALCURSE" -q -D "$PWD/.calcurse" -i "$DATA_DIR/ical-014.ical"
-  "$CALCURSE" -D "$PWD/.calcurse" -x | 
+  tmpdir=$(mktemp -d)
+  cp "$DATA_DIR/conf" "$tmpdir" || exit 1
+  "$CALCURSE" -q -D "$tmpdir" -i "$DATA_DIR/ical-014.ical"
+  "$CALCURSE" -D "$tmpdir" -x |
   sed -n '
 	/DESCRIPTION/p
 	/LOCATION/p
 	/COMMENT/p
   ' |
   sort
-  rm -rf .calcurse || exit 1
+  rm -rf "$tmpdir" || exit 1
 elif [ "$1" = 'expected' ]; then
   cat "$DATA_DIR/ical-014.ical" |
   sed -n '