assertTrue(map.isEmpty());
    }

    // Test getDataMap with ParamMap
    @Test
    public void test_getDataMapWithParamMap() {
        Map<String, Object> innerMap = new HashMap<>();
        innerMap.put("key1", "value1");
        ParamMap<String, Object> paramMap = new ParamMap<>(innerMap);

        Map<String, Object> result = DataStoreParams.getDataMap(paramMap);
        assertSame(innerMap, result);
    }

        final RenderData renderData = new RenderData();
        method.invoke(action, renderData);

        @SuppressWarnings("unchecked")
        final List<String> extraFieldNames = (List<String>) renderData.getDataMap().get("extraFieldNames");
        assertNotNull(extraFieldNames);
        // Config-defined field "anchor" is not in STANDARD_EDIT_FIELDS, so it appears as extra
        assertTrue(extraFieldNames.contains("anchor"));