Update tests/get_paths.sh

Co-authored-by: Michael Valdron <mvaldron@redhat.com>

Author: JslYoon

tests/get_paths.sh

@@ -10,7 +10,11 @@ parse_arguments() {
     while [[ $# -gt 0 ]]; do
         case $1 in
             --stackDirs)
-                stackDirs=$2
+                if [ -z "${stackDirs}" ]; then
+                    stackDirs=$2
+                else
+                    stackDirs="${stackDirs} $2"
+                fi
                 shift # past argument
                 shift
                 ;;