Add missing tests + minor test changes.
Add missing tests + minor test changes.

jayvdb/pep257,tescalada/pydocstyle,13steinj/pep257,Nurdok/pep257,pombredanne/pep257,bartvm/pep257,farmersez/pydocstyle,codehs/pep257,glennmatthews/pep257,jmullan/pep257,Nurdok/pydocstyle,GreenSteam/pep257,PyCQA/pydocstyle,jbeezley/pep257,bagelbits/pep257