The nose testing framework is dead and no longer maintained, from https://nose.readthedocs.io/en/latest/

Nose has been in maintenance mode for the past several years and will likely cease without a new person/team to take over maintainership. New projects should consider using Nose2, py.test, or just plain unittest/unittest2.

We should drop dependency on nose and replace all usage of nose with unittest or pytest package. Most changes can be automated:

• Replace raise nose.SkipTest with raise unittest.SkipTest
• Replace nose.tools.assert_equal(a, b) with assert a == b
• Replace nose.tools.raises with pytest.raises