add removal test

cayley.go

@@ -191,6 +191,28 @@ func main() {
 }
 
 func load(qw graph.QuadWriter, cfg *config.Config, path, typ string) error {
+	return decompressAndLoad(qw, cfg, path, typ, db.Load)
+}
+
+func removeAll(qw graph.QuadWriter, cfg *config.Config, path, typ string) error {
+	return decompressAndLoad(qw, cfg, path, typ, remove)
+}
+
+func remove(qw graph.QuadWriter, cfg *config.Config, dec quad.Unmarshaler) error {
+	for {
+		t, err := dec.Unmarshal()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		qw.RemoveQuad(t)
+	}
+	return nil
+}
+
+func decompressAndLoad(qw graph.QuadWriter, cfg *config.Config, path, typ string, loadFn func(graph.QuadWriter, *config.Config, quad.Unmarshaler) error) error {
 	var r io.Reader
 
 	if path == "" {