diff --git a/tests/codes_export_resource.sh b/tests/codes_export_resource.sh
index c9795e944..fddb45c45 100755
--- a/tests/codes_export_resource.sh
+++ b/tests/codes_export_resource.sh
@@ -43,6 +43,12 @@ cmp $ECCODES_DEFINITION_PATH/$f $temp
 
 # Failing cases
 # ----------------
+set +e
+${tools_dir}/codes_export_resource
+status=$?
+set -e
+[ $status -eq 1 ]
+
 set +e
 ${tools_dir}/codes_export_resource -d nonexistent $temp
 status=$?
@@ -55,6 +61,11 @@ status=$?
 set -e
 [ $status -eq 1 ]
 
+set +e
+${tools_dir}/codes_export_resource -z A B
+status=$?
+set -e
+[ $status -eq 1 ]
 
 
 # Clean up
diff --git a/tests/codes_split_file.sh b/tests/codes_split_file.sh
index 88021b4c2..9f5577f14 100755
--- a/tests/codes_split_file.sh
+++ b/tests/codes_split_file.sh
@@ -16,6 +16,7 @@ temp=$label.temp.grib
 
 # Do all the work in a temporary directory
 temp_dir=tempdir.${label}
+rm -rf $temp_dir
 mkdir -p $temp_dir
 cd $temp_dir
 
@@ -59,6 +60,14 @@ total=`${tools_dir}/codes_count tigge_ecmwf.grib2_[0-9]*`
 cat tigge_ecmwf.grib2_[0-9][0-9][0-9] > $temp
 ${tools_dir}/grib_compare $input $temp
 
+# Failing cases
+# ----------------
+set +e
+${tools_dir}/codes_split_file
+status=$?
+set -e
+[ $status -eq 1 ]
+
 
 # Clean up
 cd $test_dir