The test in general is fine, but it was making an assumption that the
first 5 readyRead emissions would never result in the whole message
being received. In certain scenarios with slowdown however it was still
possible that we would receive the whole message after just a few
readyReady emissions. While I didn't check it's most likely due to a
mechanic in the QNetworkReply machinery where we suppress some
emissions if we know there's more data just about to be available.
Task-number: QTBUG-88943
Change-Id: I0cf06edb34d4e86cc8a42c0f1cd7e8c35765f6ee
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
0592369df4