Description:

Now that I'm starting to understand the testing slightly better, I rewrote the Plex tests to implement several changes:

• Put mocked constants into a dictionary array
• Changed mock classes to better reflect actual objects used/returned by plexapi
• Set up the number of mocked available servers with a parameter
• Avoid using difficult-to-follow MagicMock and PropertyMock setups
• Moved flow steps that don't need to be mocked outside of patch context

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If the code does not interact with devices:

• Tests have been added to verify that the new code works.