[MASSEMBLY-741] wrong paths in file-modes tests

Patch by Sven Meier, applied unmodified

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1643322 13f79535-47bb-0310-9956-ffa450edef68
[MASSEMBLY-739] Added testcase project

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1643324 13f79535-47bb-0310-9956-ffa450edef68