Split up tests into separate methods

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/email/trunk@1507432 13f79535-47bb-0310-9956-ffa450edef68
Remove unnecessary assertions

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/email/trunk@1507435 13f79535-47bb-0310-9956-ffa450edef68