Restructure the test suite to follow the code

[Armavica]

What is this PR about?
This PR splits up several test files as discussed in #5777.

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

• ...

Bugfixes / New features

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Docs / Maintenance

• Split up several test files to follow the code file hierarchy.

[codecov]

Codecov Report

Merging #6111 (1558472) into main (761f77d) will increase coverage by 0.61%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #6111      +/-   ##
==========================================
+ Coverage   92.08%   92.69%   +0.61%     
==========================================
  Files          86       99      +13     
  Lines       17861    20531    +2670     
==========================================
+ Hits        16447    19032    +2585     
- Misses       1414     1499      +85     

Impacted Files	Coverage Δ
pymc/tests/backends/fixtures.py	77.99% <ø> (ø)
pymc/tests/backends/test_arviz.py	99.02% <ø> (ø)
pymc/tests/gp/test_cov.py	99.81% <ø> (ø)
pymc/tests/ode/test_ode.py	100.00% <ø> (ø)
pymc/tests/step_methods/hmc/test_quadpotential.py	95.81% <ø> (ø)
pymc/tests/variational/test_updates.py	100.00% <ø> (ø)
pymc/tests/backends/test_ndarray.py	100.00% <100.00%> (ø)
pymc/tests/distributions/test_multivariate.py	99.50% <100.00%> (+<0.01%)	⬆️
pymc/tests/gp/test_gp.py	100.00% <100.00%> (ø)
pymc/tests/gp/test_mean.py	100.00% <100.00%> (ø)
... and 21 more

[Armavica]

I didn't touch yet: test_posteriors, test_step, test_variational_inference, but will take care of them soon.

I looked at test_missing, test_shared and test_types and couldn't decide where to put them. Would you have an idea about these three?

[canyon289]

Suggested change

	"""The test return 0 if the matrix has 0 eigenvalue.
	"""The test returns 0 if the matrix has 0 eigenvalue.

[canyon289]

I know youre just restructuring these so this isnt required, just commenting. Would be nice to paramterizing these

[ricardoV94]

test_missing corresponds to functionality implemented in model I think, so test_model might be a good place.

test_shared corresponds to uses of pm.Data? If so, wherever that is implemented.

[Armavica]

test_shared corresponds to uses of pm.Data? If so, wherever that is implemented.

I don't think that it uses anything from data.py. It is directly using aesara.shared.

[canyon289]

looked through this and it LGTM. coverage is showing more test coverage as well. we should merge before theres any conflicts that arise and follow up in prs imo

[canyon289]

I didn't touch yet: test_posteriors, test_step, test_variational_inference, but will take care of them soon.

I looked at test_missing, test_shared and test_types and couldn't decide where to put them. Would you have an idea about these three?

Lets do this in another PR to save you rebase headache. This many files changed always make me nervous and rebasing across file changes is a real pain

[canyon289]

Thanks much @Armavica