[Flow] Functional test child objects show in Descending order

[Rocky Ou]

Hi,

The Blog entity has Post entity as its child. The Blog is the Aggregate 
root for Post. Post has property date which is Datetime type. It is used 
for Descending ordering. Manually testing using Chrome renders the Post 
in Desc order. But $response->getContent() in the Funcitonal testing 
shows the Post in Ascending order.

How can I test "Showing Objects in Descending order" in functional 
testing please?