static CosmosPagedFlux getMockPagedFluxForQueryOrChangeFeed(List<CloudBlobMetadata> documentList) {
    FeedResponse feedResponse = mock(FeedResponse.class);
    when(feedResponse.getResults()).thenReturn(documentList);
    CosmosPagedFlux cosmosPagedFlux = mock(CosmosPagedFlux.class);
    when(cosmosPagedFlux.byPage(anyInt())).thenReturn(Flux.just(feedResponse));
    return cosmosPagedFlux;
  }
Utility to mock return value of {@link CosmosAsyncContainer#queryItems(SqlQuerySpec, CosmosQueryRequestOptions, Class)}
or {@link CosmosAsyncContainer#queryChangeFeed(CosmosChangeFeedRequestOptions, Class)}.
@param documentList {@link List <T>} of documents to return from mocked call.
@return {@link CosmosPagedFlux} containing document list.
ambry-cloud/src/test/java/com/github/ambry/cloud/azure/AzureTestUtils.java