The Maven plugin integration tests changed completely between the 2.2.x branch and master. This makes forward-porting changes to the Maven plugin from 2.2.x harder than they should be.
The integration testing approach on master is a big improvement over what's on 2.2.x, as it allows test cases to easily assert contents of the build log output, makes it possible to share a test project between test cases, and generally gives more control to individual tests cases.
Comment From: philwebb
Since 2.2.x is now out of OSS support I'm going to close this one.