The Castrol Honda World Superbike team ran through a range of technical developments for possible use on next year's 2012 CBR1000RR, during a private three-way test at Losail, in Qatar.
Rea, who missed four rounds of the 2011 season after wrist surgery following a crash at Misano in June, used the test to try a new swingarm, Ohlins suspension and other chassis components.
"We've got through a lot of work these three days and ended with two long runs today, which was pretty tough in the heat. We've tried heaps of stuff and, like the last couple of tests, we ended up running out of time," said Rea.
"But it's still been really productive and I'm looking forward to starting the next test on my favourite combination of components because we weren't able to finish on that today.
"We've been making some quite big changes to the bike, just to feel the difference between the various set-ups and everyone has been working really well. It was good to be back at this circuit too; I like it here, and I'm really looking forward to getting back on the bike again in January."
No lap times were released, but team manager Ronald ten Kate stated that both Rea and new team-mate Hiroshi Aoyama had been "under the lap record".
The Dutchman also revealed that the team's new ride-by-wire system took another step forward.
"Jonathan has worked on chassis parts for the 2012 machine and we introduced ride-by-wire electronics for the first time for on-throttle riding," he said. "Before we have only used it on corner entry, but now we have been working on corner exit, too. The results of this have been very positive and clear."
Ten Kate added: "We set ourselves a lot of goals for the development of the bike for next season and we have managed to tick a lot of boxes during this test, so we can start putting the 2012 bikes together now."