# Run the tests
if test -z "$NOTMUCH_TEST_SERIALIZE" && command -v parallel >/dev/null ; then
test -t 1 && export COLORS_WITHOUT_TTY=t || :
- if parallel -h | grep -q GNU ; then
+ if parallel --version 2>&1 | grep -q GNU ; then
echo "INFO: running tests with GNU parallel"
printf '%s\n' $TESTS | $TEST_TIMEOUT_CMD parallel
else