Make core-buffer folder with all common stuff used in the buffer

core-buffer/test/mock/udp.hpp

@@ -0,0 +1,16 @@
+#ifndef MOCK_UDP_H
+#define MOCK_UDP_H
+
+const int MOCK_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