[MPLUGIN-242] reverted unit test in r1590803 since it breaks actual maven-plugin-plugin build which is using plugin-tools 3.2 (affected by the bug)

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1590812 13f79535-47bb-0310-9956-ffa450edef68