diff --git a/scripts/test.sh b/scripts/test.sh
index b7c407b6..ffd37f82 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -1,4 +1,7 @@
-#!/bin/sh
+#!/bin/sh -e
 P=`dirname $0`
 RESOURCES=`$P/resources.sh`
-$P/run.sh test.py $RESOURCES --coverage -pvcw "$@"
+if [ $# -eq 0 ]; then
+    coverage="--coverage"
+fi
+$P/run.sh test.py $RESOURCES $coverage -pvcw "$@"