Improve test parameterisation #15
Description
zuo/unittest_expander#7 is reasonably annoying.
Investigate switching to https://github.com/msabramo/python_unittest_parameterized_test_case
If it solves that, do not mrege until msabramo/python_unittest_parameterized_test_case#5 is fixed otherwise the tests can not be run in RPM builds.