* diff_tests.py (diff_base_to_repos): vastly expand this test's coverage.
* diff_tests.py (diff_base_to_repos): vastly expand this test's coverage.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion