Use JUnit annotations to test failure cases

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/email/trunk@1510634 13f79535-47bb-0310-9956-ffa450edef68
Use JUnit annotations to test failure cases

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/email/trunk@1510635 13f79535-47bb-0310-9956-ffa450edef68