Externalize in mock class

core-writer/test/mock/udp.hpp

@@ -0,0 +1,16 @@
+#ifndef MOCK_UDP_H
+#define MOCK_UDP_H
+
+const int UDP_PORT(13000);
+
+sockaddr_in get_server_address(uint16_t udp_port)
+{
+    sockaddr_in server_address = {0};
+    server_address.sin_family = AF_INET;
+    server_address.sin_addr.s_addr = INADDR_ANY;
+    server_address.sin_port = htons(udp_port);
+
+    return server_address;
+}
+
+#endif

core-writer/test/test_UdpReceiver.cpp

@@ -2,16 +2,8 @@
 #include <jungfrau.hpp>
 #include "gtest/gtest.h"
 #include "UdpReceiver.hpp"
+#include "mock/udp.hpp"
 
-sockaddr_in get_server_address(uint16_t udp_port)
-{
-    sockaddr_in server_address = {0};
-    server_address.sin_family = AF_INET;
-    server_address.sin_addr.s_addr = INADDR_ANY;
-    server_address.sin_port = htons(udp_port);
-
-    return server_address;
-}
 
 TEST(UdpReceiver, simple_recv)
 {