Add test for WINDOW_UPDATE against reserved

tests/nghttp2_session_test.c

@@ -1177,6 +1177,20 @@ void test_nghttp2_session_on_window_update_received(void)
 
   nghttp2_frame_window_update_free(&frame.window_update);
 
+  /* WINDOW_UPDATE against reserved stream is a connection error */
+  stream = nghttp2_session_open_stream(session, 2, NGHTTP2_FLAG_NONE,
+                                       NGHTTP2_PRI_DEFAULT,
+                                       NGHTTP2_STREAM_RESERVED, NULL);
+
+  nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE,
+                                   2, 4096);
+
+  CU_ASSERT(!(session->goaway_flags & NGHTTP2_GOAWAY_FAIL_ON_SEND));
+  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
+  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_FAIL_ON_SEND);
+
+  nghttp2_frame_window_update_free(&frame.window_update);
+
   nghttp2_session_del(session);
 }