Ref T275, unit tests for FSX/P3D

In that very case testing the offsets for request ids

tests/blacksimpluginfsxp3d/testblacksimpluginfsxp3dmain.h

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+/* Copyright (C) 2018
+ * swift project community / contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKSIMPLUGINFSXP3D_TESTMAIN_H
+#define BLACKSIMPLUGINFSXP3D_TESTMAIN_H
+
+//! \cond PRIVATE_TESTS
+//! \file
+//! \ingroup testplugins
+
+namespace BlackSimPluginFsxP3D
+{
+    /*!
+     * Class firing all unit tests in this namespace.
+     * Avoids clashes with other main(..) functions and allows to fire the test cases
+     * simply from any other main.
+     */
+    class CBlackSimPluginFsxP3DTest
+    {
+    public:
+        //! Starting all
+        static int unitMain(int argc, char *argv[]);
+    };
+} // ns
+
+//! \endcond
+
+#endif // guard