add license headers

frontend/test/util.dart

@@ -1,3 +1,22 @@
+/*
+ * Copyright 2022 Barabas Raffai
+ *
+ * This file is part of ShrapnelDSP.
+ *
+ * ShrapnelDSP is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * ShrapnelDSP is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ShrapnelDSP. If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import 'dart:async';
 
 import 'package:flutter_test/flutter_test.dart';

frontend/test/wifi_provisioning_page_object.dart

@@ -1,3 +1,22 @@
+/*
+ * Copyright 2022 Barabas Raffai
+ *
+ * This file is part of ShrapnelDSP.
+ *
+ * ShrapnelDSP is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * ShrapnelDSP is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ShrapnelDSP. If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';