Not if it was a test run for something bigger,,, who knows?
Your sub-theory that this was a trial fits right into the terrorist SOP:
1. We know that the 911 hijackers flew the flights they intended to hijack. And the English islamnutjobs who were going to use liquid bombs assembled in midair also did test flights.
2. The unsolved crash of a Brazil-France flight would not garner as much attention as say, a London-New York or LA-New York flight. Plus, a crash over an ocean would leave less evidence than a crash over land.
3. The Airbus is a EU product - and the Muslims have heavily infiltrated Europe, including (especially?) France, providing easier access to knowledge of Airbus operating systems and aircraft maintenance jobs than in the U.S.
As you say, this could have been the test run for a grand mid-Atlantic attack on 5 or 10 planes, just as the British liquid bomb job was planned to be.