first dest handler unittests

- Add new mock class for event reporting proxies
- Add basic setup for unittesting the CFDP destination handler

unittests/mocks/EventReportingProxyMock.h

@@ -0,0 +1,21 @@
+#ifndef FSFW_TESTS_EVENTREPORTPROXYMOCK_H
+#define FSFW_TESTS_EVENTREPORTPROXYMOCK_H
+
+#include <queue>
+
+#include "fsfw/events/EventReportingProxyIF.h"
+
+class EventReportingProxyMock : public EventReportingProxyIF {
+ public:
+  void forwardEvent(Event event, uint32_t parameter1, uint32_t parameter2) const override;
+
+  struct EventInfo {
+    EventInfo(Event event, uint32_t p1, uint32_t p2) : event(event), p1(p1), p2(p2) {}
+
+    Event event;
+    uint32_t p1;
+    uint32_t p2;
+  };
+  mutable std::queue<EventInfo> eventQueue;
+};
+#endif  // FSFW_TESTS_EVENTREPORTPROXYMOCK_H