Often when a new engine enters flight test on a multi-engine aircraft, the first few flights may be done with a proven engine on one side and the new power plant on the other side. Another approach is to have a dedicated engine test aircraft with multiple proven engines and an engine station dedicated to whatever engine is in need of test. The article at the link below is hazy regarding the PurePower test. Nowhere does it say PurePower "Engines"... It always says "engine". I'm guessing that the plane was fully configured with two of them, but it never says that straight out.
http://mro-network.com/news/2016/03/first-test-flight-pratt-powered-a321neo/8661
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