assertEquals("/fess/go/?rt=1710000000&docId=doc123&queryId=query456&order=2", url);
    }

    @Test
    public void test_buildGoUrl_nullDocId() {
        assertNull(chatClient.testBuildGoUrl("", null, "query456", 1710000000L, 0));
    }

    @Test
    public void test_buildGoUrl_nullQueryId() {