Add skeleton for TestDatabase.cpp and test data for unit tests for the "empty recycle bin" functionality

tests/TestDatabase.h

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (C) 2017 Vladimir Svyatski <v.unreal@gmail.com>
+ *
+ *  This program 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 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_TESTDATABASE_H
+#define KEEPASSX_TESTDATABASE_H
+
+#include <QObject>
+
+class Database;
+
+class TestDatabase : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void initTestCase();
+    void testEmptyRecycleBinOnDisabled();
+    void testEmptyRecycleBinOnNotCreated();
+    void testEmptyRecycleBinOnEmpty();
+    void testEmptyRecycleBinWithHierarchicalData();
+};
+
+#endif // KEEPASSX_TESTDATABASE_H