Move away from nose for the unittests

[fabaff]

What is the problem?

nose was not maintained for the last 5 years and Fedora will no longer ship it. This means that all packages which depends on nose are no longer able to run the unit tests during the RPM build process.

Expected behavior

Running the unit test with pytest.

Actual behavior

Requires nose to run tests.

Origin: https://bugzilla.redhat.com/show_bug.cgi?id=1834977#c1

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[carlwgeorge]

.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[fabaff]

Still relevant.

[fabaff]

Would be fixed by #78