TESt failures on an (Intel) Mac

[ChrisBarker-NOAA]

With the 3.1.8 release, from source, I'm getting segfaults on the tests -- I tried Python 3.11 and 3.12, and even a install of the conda-forge package -- all segfault on the tests.

With the latest master branch, the tests don't segfault, but they do get a lot of failures, and then hang.

Is this expected to work in a Mac? -- at least the hang seems it may be related to the Mac's weird window manager issues ....