diff --git a/tests/tests.sh b/tests/tests.sh
index 6e4fac8..ed823dc 100755
--- a/tests/tests.sh
+++ b/tests/tests.sh
@@ -107,13 +107,16 @@ _usage()
 
 #main
 clean=0
-while getopts "cP:" name; do
+while getopts "cO:P:" name; do
 	case "$name" in
 		c)
 			clean=1
 			;;
+		O)
+			export "${OPTARG%%=*}"="${OPTARG#*=}"
+			;;
 		P)
-			#we can ignore it
+			#ignored
 			;;
 		?)
 			_usage