Fix Junit test for V3.9 and issue #2305

Motivation:
The Junit test for issue #2305 was incomplete for V3.9 since the request was not setup using setChunked(true) and therefore the chunks were ignored.

Modifications:
Add the chunk true property to the request and add the final LAST_CHUNK to the chunks offered to the decoder.

Result:
Now the request is correctly and fully decoded by the decoder in this Junit test case.