Problem: test_security_gssapi expects wrong event

Solution: fix it

tests/test_security_gssapi.cpp

@@ -216,8 +216,10 @@ void test_null_creds (void *ctx, void *server, void *server_mon, char *endpoint)
     close_zero_linger (client);
 
 #ifdef ZMQ_BUILD_DRAFT_API
-    int event = get_monitor_event (server_mon, NULL, NULL);
-    assert (event == ZMQ_EVENT_HANDSHAKE_FAILED_AUTH);
+    int error;
+    int event = get_monitor_event (server_mon, &error, NULL);
+    assert (event == ZMQ_EVENT_HANDSHAKE_FAILED_PROTOCOL);
+    assert (error == ZMQ_PROTOCOL_ERROR_ZMTP_MECHANISM_MISMATCH);
 #endif
 }
 
@@ -318,7 +320,8 @@ int main (void)
 #ifdef ZMQ_BUILD_DRAFT_API
     //  Monitor handshake events on the server
     rc = zmq_socket_monitor (server, "inproc://monitor-server",
-            ZMQ_EVENT_HANDSHAKE_SUCCEEDED | ZMQ_EVENT_HANDSHAKE_FAILED_AUTH);
+            ZMQ_EVENT_HANDSHAKE_SUCCEEDED | ZMQ_EVENT_HANDSHAKE_FAILED_AUTH |
+            ZMQ_EVENT_HANDSHAKE_FAILED_PROTOCOL);
     assert (rc == 0);
 #endif