The host nation will face either France or Samoa in their last-eight match, and McNamara is pleased with the way his side are clicking into gear.
"It was a proper Test match, we always knew it would be," the 42-year-old told Sky Sports News.
"It was a very tough test match. It's exactly the test we needed. I think it bodes well for us in the quarter-finals."
Australia qualified from Group A as winners.