runtests.sh: use 0 to control arg parse loop

diff --git a/runtests.sh b/runtests.sh
index b7313b79b91197b9f77c7951a9f6cbf3f792e3d5..30ddeeffa89aa363209808855d1874d29d95e148 100755 (executable)
--- a/runtests.sh
+++ b/runtests.sh
@@ -29,7 +29,7 @@ trap interrupted SIGINT
 
 unused_args=()
 
-while [[ -n $1 ]] ; do
+while [ $# -gt 0 ] ; do
        case "$1" in
                --python-versions=*)
                        PYTHON_VERSIONS=${1#--python-versions=}