Fix test for mac os

examples/producer/dummy-data-producer/check_linux.sh

@@ -6,5 +6,5 @@ database_name=test_run
 
 
 #just test that it starts, no reciever is running
-$@ 0.0.0.0 1 1 2>&1 | grep "refused"
+$@ 0.0.0.0 1 1 2>&1 | grep "Failed to connect"
 

receiver/unittests/test_request.cpp

@@ -44,7 +44,7 @@ class MockReqestHandler : public hidra2::RequestHandler {
         return Error{ProcessRequest_t(request)};
     }
 
-    StatisticEntity GetStatisticEntity() const {
+    StatisticEntity GetStatisticEntity() const override {
         return StatisticEntity::kDisk;
     }