diff --git a/ctl/backup_test.go b/ctl/backup_test.go
new file mode 100644
index 000000000..149157953
--- /dev/null
+++ b/ctl/backup_test.go
@@ -0,0 +1,15 @@
+package ctl
+
+import (
+	"testing"
+	"golang.org/x/net/context"
+)
+
+func TestBackupCommand_FileRequired(t *testing.T){
+	cm := BackupCommand{}
+	ctx := context.Background()
+	err := cm.Run(ctx)
+	if err.Error() != "output file required"{
+		t.Fatalf("Command not working, expect: output file required, actual: '%s'", err)
+	}
+}