improve it test

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1448944 13f79535-47bb-0310-9956-ffa450edef68
improve it test for doxia timestamp

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1448945 13f79535-47bb-0310-9956-ffa450edef68