Add test: FileDocumentTest

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549334 13f79535-47bb-0310-9956-ffa450edef68
Add test: testNonIsComposite

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549335 13f79535-47bb-0310-9956-ffa450edef68