@Testvoid shouldCorrectlyAggregate_whenMultipleFetchParamsResults() {    // 准备数据    List<FetchParam> fetchParams = Arrays.asList(new FetchParam(), new FetchParam());    Set<OriginalFieldFetcher> fetchers = new HashSet<>(singletonList(mockFetcher1));
    Map<OriginalFieldDef, Object> dataMap1 = new HashMap<>();    dataMap1.put(OriginalFieldDef.orderId, "value1");
    Map<OriginalFieldDef, Object> dataMap2 = new HashMap<>();    dataMap2.put(OriginalFieldDef.orderStatus, "value2");
    when(mockFetcher1.batchQuery(fetchParams))            .thenReturn(Arrays.asList(                    new FetchTargetOriginalData(1L, dataMap1),                    new FetchTargetOriginalData(2L, dataMap2)            ));
    // 执行    Map<Long, Map<OriginalFieldDef, Object>> result = executor.doFetchersBatchQuery(fetchParams, fetchers);
    // 验证    assertEquals(2, result.size(), "应处理并返回两个不同主体ID的结果");    assertEquals(1, result.get(1L).size(), "第一个主体ID下应有一个字段数据");    assertEquals(1, result.get(2L).size(), "第二个主体ID下应有一个字段数据");}