Add test for constructor and assignment operator
Add test for constructor and assignment operator

Change-Id: I4a475ca6e173a7102d465d821f1427d0b6d206d0
Reviewed-by: Kurt Pattyn <da83d6ada5df79ff647b4271d0d788c6f1bafca2@gmail.com>

SfietKonstantin/qtwebsockets,pixty/qtwebsockets,remimixlr/QtWebsocket,pixty/qtwebsockets