assertEquals("test value", data.getDataMap().get("key1"));

        RenderDataUtil.register(data, "key2", "");
        assertEquals("", data.getDataMap().get("key2"));
    }

    @Test
    public void test_register_primitives() {
        RenderData data = new RenderData();

        RenderDataUtil.register(data, "int", 123);
        assertEquals(123, data.getDataMap().get("int"));

        RenderDataUtil.register(data, "long", 456L);