These are the two datasets used in Automatic Content-based Categorization of Wikipedia Articles:

• Eishockey (ice hockey): train - test
• Philosoph (philosopher) train - test

Article

• Zeno Gantner, Lars Schmidt-Thieme (2009):
  Automatic Content-based Categorization of Wikipedia Articles, in The People's Web Meets NLP: Collaboratively Constructed Semantic Resources. Workshop at Joint Conference of the 47th Annual Meeting of the Association for Computational Linguistics and the 4th International Joint Conference on Natural Language Processing of the Asian Federation of Natural Language Processing (ACL 2009).