Remove yield test that are not support by pytest anymore...
Remove yield test that are not support by pytest anymore
And remove comparison of str/unicode as it is not relevant anymore as
both are the same.
We can now unpin pytest as well, which we should make sure is in release
notes and in the conda-forge recipe
As nose does not understand `@parametrize`, and the nose `@skip`
decorator messes with that as well, we mark tests with parametrize as
not-tests for iptests
