Problem: no test case for tcp name resolution no longer working

Solution: add test case

tests/test_pair_tcp.cpp

@@ -80,6 +80,36 @@ void test_pair_tcp_regular ()
     test_pair_tcp ();
 }
 
+void test_pair_tcp_connect_by_name ()
+{
+    // all other tcp test cases bind to a loopback wildcard address, then
+    // retrieve the bound endpoint, which is numerical, and use that to
+    // connect. this test cases specifically uses "localhost" to connect
+    // to ensure that names are correctly resolved
+    void *sb = test_context_socket (ZMQ_PAIR);
+
+    char bound_endpoint[MAX_SOCKET_STRING];
+    bind_loopback_ipv4 (sb, bound_endpoint, sizeof bound_endpoint);
+
+    // extract the bound port number
+    const char *pos = strrchr (bound_endpoint, ':');
+    TEST_ASSERT_NOT_NULL (pos);
+    const char connect_endpoint_prefix[] = "tcp://localhost";
+    char connect_endpoint[MAX_SOCKET_STRING];
+    strcpy (connect_endpoint, connect_endpoint_prefix);
+    strcat (connect_endpoint, pos);
+
+    void *sc = test_context_socket (ZMQ_PAIR);
+
+    TEST_ASSERT_SUCCESS_ERRNO (zmq_connect (sc, connect_endpoint));
+
+    bounce (sb, sc);
+
+    test_context_socket_close (sc);
+    test_context_socket_close (sb);
+}
+
+
 #ifdef ZMQ_BUILD_DRAFT
 void test_pair_tcp_fastpath ()
 {
@@ -93,6 +123,7 @@ int main ()
 
     UNITY_BEGIN ();
     RUN_TEST (test_pair_tcp_regular);
+    RUN_TEST (test_pair_tcp_connect_by_name);
 #ifdef ZMQ_BUILD_DRAFT
     RUN_TEST (test_pair_tcp_fastpath);
 #endif