test/rcon: name sockets fds more clearly

Distinguishing between `sv[0]` and `sv[1]` gets old after a while...
Let's name them `client` and `server` for clarity.

test/test_rcon.c

@@ -16,84 +16,93 @@ static void assert_packet_equals(const rcon_packet_t *packet,
                    (int32_t)(sizeof(int32_t) * 2 + strlen(expected_body) + 2));
 }
 
+typedef struct {
+  int client;
+  int server;
+} socketpair_t;
+
+static socketpair_t create_socketpair() {
+  int sv[2];
+  assert_int_equal(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
+  socketpair_t sp = {.client = sv[0], .server = sv[1]};
+  return sp;
+}
+
+static void close_socketpair(socketpair_t *sockets) {
+  close(sockets->client);
+  close(sockets->server);
+}
+
 static void test_serialization_roundtrip_command_packet(void **state) {
   (void)state;
 
-  int sv[2];
-  assert_int_equal(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
+  socketpair_t sockets = create_socketpair();
 
   const int32_t id = 123;
   const int32_t type = RCON_SERVERDATA_EXECCOMMAND;
   const char *body = "execute as @a run data get entity @s Pos";
 
-  send_packet(sv[0], id, type, body);
+  send_packet(sockets.client, id, type, body);
 
   rcon_packet_t packet = {0};
-  assert_int_equal(recv_packet(sv[1], &packet), 0);
+  assert_int_equal(recv_packet(sockets.server, &packet), 0);
   assert_packet_equals(&packet, id, type, body);
 
-  close(sv[0]);
-  close(sv[1]);
+  close_socketpair(&sockets);
 }
 
 static void test_serialization_roundtrip_auth_packet(void **state) {
   (void)state;
 
-  int sv[2];
-  assert_int_equal(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
+  socketpair_t sockets = create_socketpair();
 
   const int32_t id = 1;
   const int32_t type = RCON_SERVERDATA_AUTH;
   const char *body = "correct horse battery staple";
 
-  send_packet(sv[0], id, type, body);
+  send_packet(sockets.client, id, type, body);
 
   rcon_packet_t packet = {0};
-  assert_int_equal(recv_packet(sv[1], &packet), 0);
+  assert_int_equal(recv_packet(sockets.server, &packet), 0);
   assert_packet_equals(&packet, id, type, body);
 
-  close(sv[0]);
-  close(sv[1]);
+  close_socketpair(&sockets);
 }
 
 static void test_serialization_roundtrip_empty_body_packet(void **state) {
   (void)state;
 
-  int sv[2];
-  assert_int_equal(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
+  socketpair_t sockets = create_socketpair();
 
   const int32_t id = 101;
   const int32_t type = RCON_SERVERDATA_EXECCOMMAND;
   const char *body = "";
 
-  send_packet(sv[0], id, type, body);
+  send_packet(sockets.client, id, type, body);
 
   rcon_packet_t packet = {0};
-  assert_int_equal(recv_packet(sv[1], &packet), 0);
+  assert_int_equal(recv_packet(sockets.server, &packet), 0);
   assert_packet_equals(&packet, id, type, body);
 
-  close(sv[0]);
-  close(sv[1]);
+  close_socketpair(&sockets);
 }
 
 static void test_serialization_roundtrip_max_supported_body(void **state) {
   (void)state;
 
-  int sv[2];
-  assert_int_equal(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
+  socketpair_t sockets = create_socketpair();
 
   char body[4095];
   memset(body, 'A', sizeof(body) - 1);
   body[sizeof(body) - 1] = '\0';
 
-  send_packet(sv[0], 777, RCON_SERVERDATA_RESPONSE_VALUE, body);
+  send_packet(sockets.client, 777, RCON_SERVERDATA_RESPONSE_VALUE, body);
 
   rcon_packet_t packet = {0};
-  assert_int_equal(recv_packet(sv[1], &packet), 0);
+  assert_int_equal(recv_packet(sockets.server, &packet), 0);
   assert_packet_equals(&packet, 777, RCON_SERVERDATA_RESPONSE_VALUE, body);
 
-  close(sv[0]);
-  close(sv[1]);
+  close_socketpair(&sockets);
 }
 
 int main(void) {