niklas's leaves test as a doctest
niklas's leaves test as a doctest

armandobs14/rdflib,yingerj/rdflib,dbs/rdflib,ssssam/rdflib,avorio/rdflib,dbs/rdflib,yingerj/rdflib,marma/rdflib,RDFLib/rdflib,armandobs14/rdflib,armandobs14/rdflib,armandobs14/rdflib,dbs/rdflib,marma/rdflib,dbs/rdflib,avorio/rdflib,ssssam/rdflib,ssssam/rdflib,avorio/rdflib,RDFLib/rdflib,RDFLib/rdflib,yingerj/rdflib,marma/rdflib,RDFLib/rdflib,marma/rdflib,avorio/rdflib,yingerj/rdflib,ssssam/rdflib