add small test for aggregators

sources/test/testextitemaggregator.h

@@ -0,0 +1,44 @@
+/***************************************************************************
+ *   This file is part of awesome-widgets                                  *
+ *                                                                         *
+ *   awesome-widgets 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.                       *
+ *                                                                         *
+ *   awesome-widgets 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 awesome-widgets. If not, see http://www.gnu.org/licenses/  *
+ ***************************************************************************/
+
+
+#ifndef TESTEXTITEMAGGREGATOR_H
+#define TESTEXTITEMAGGREGATOR_H
+
+#include <QObject>
+
+class AWNoFormatter;
+template<class T> class ExtItemAggregator;
+
+class TestExtItemAggregator : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    // initialization
+    void initTestCase();
+    void cleanupTestCase();
+    // test
+    void test_values();
+
+private:
+    ExtItemAggregator<AWNoFormatter> *aggregator = nullptr;
+    QString type = QString("tmp");
+};
+
+
+#endif /* TESTEXTITEMAGGREGATOR_H */