Expand platforms that unit tests run on

[fcooper8472]

Previously, unit tests have only been run on x86_64 platforms, but these have included all current (and two old) python CPython version.

I propose testing:

• All current python versions, each on two different operating systems
• The most recent deceased python version
• The next pre-release version (to check future compatibility)

Along with each of Ubuntu, macOS and Windows, both x86_64 and arm64 architectures, just to check there are no nasty surprises for users.

The current syntax I'm proposing is a little ugly. But it's not justifiable to do the full cartesian product of all pythons and operating systems.

[MichaelClerx]

Can we restrict the stan stuff to one version?
It only runs on 3.10, 3.11, and 3.12, I think

[fcooper8472]

Yes, I'll restrict the .[stan] builds.

[MichaelClerx]

Possible to have it default to "" instead of respecifying every time?

[fcooper8472]

Yes, we can do this. Good thinking.

[MichaelClerx]

Just out of curiousity: Would it be less verbose to run a full matrix but put some if() condition in that rejects certain (i,j) combos? Or is that even more typing?

[fcooper8472]

Just out of curiousity: Would it be less verbose to run a full matrix but put some if() condition in that rejects certain (i,j) combos? Or is that even more typing?

I think there end up being a large number to exclude.... I'll get a proof of concept working and then let's see if it can be streamlined at all.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8312b9a) to head (cc9644d).

Additional details and impacted files

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##              main     #1742   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           97        97           
  Lines         9762      9762           
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  Hits          9762      9762           

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