diff --git a/tests/grib_sub_area_check.sh b/tests/grib_sub_area_check.sh
index a80ea6be7..9b602e4cb 100755
--- a/tests/grib_sub_area_check.sh
+++ b/tests/grib_sub_area_check.sh
@@ -17,6 +17,12 @@ if [ ! -x "${tools_dir}/gg_sub_area_check" ]; then
     exit 0
 fi
 
+set +e
+${tools_dir}/gg_sub_area_check
+status=$?
+set -e
+[ $status -ne 0 ]
+
 f1=$ECCODES_SAMPLES_PATH/GRIB1.tmpl
 f2=$ECCODES_SAMPLES_PATH/GRIB2.tmpl
 ${tools_dir}/gg_sub_area_check $f1 $f2 > $tempOut
diff --git a/tests/grib_to_ppm.sh b/tests/grib_to_ppm.sh
index 470f169ff..0b2f63308 100755
--- a/tests/grib_to_ppm.sh
+++ b/tests/grib_to_ppm.sh
@@ -17,6 +17,11 @@ if [ ! -x "${tools_dir}/grib2ppm" ]; then
     exit 0
 fi
 
+# No options
+${tools_dir}/grib2ppm
+
+${tools_dir}/grib2ppm -l 6 -u 7 -c $data_dir/sample.grib2  > $tempOut
+
 ${tools_dir}/grib2ppm $ECCODES_SAMPLES_PATH/GRIB1.tmpl > $tempOut
 ${tools_dir}/grib2ppm $ECCODES_SAMPLES_PATH/GRIB2.tmpl > $tempOut