Object result = data.getDataMap().get("mixed");
        assertEquals(mixedList, result); // Should be registered as-is since first element is not Entity
    }

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

        ComplexObject obj = new ComplexObject();
        obj.setValue("complex value");

        RenderDataUtil.register(data, "complex", obj);