Added a missing @Rule annotation.

It is a bit strange that this test succeeded in the past. With jUnit 4.11 an
exception is thrown.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1523792 13f79535-47bb-0310-9956-ffa450edef68
Switched to most recent versions of junit and EasyMock.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1523793 13f79535-47bb-0310-9956-ffa450edef68