New logical (F)FBBasis2D tests

[janden]

This introduces some new tests in the spirit of #568. Since most of the tests (all except testElement) apply to both FBBasis2D and FFBBasis2D, these are structured as a mixin. There's probably a better way to do this, so I'm open to alternatives.

Apart from this structural issue, what remains to do here is

• Remove the old tests and check that coverage doesn't go down.
• Add a test to FFBBasis2D that does something similar to testElement for FBBasis2D.
• Find some way to parameterize the tests over L and dtype, since all the new tests work for arbitrary values of these parameters.

[codecov]

Codecov Report

Merging #576 (eb92614) into develop (11e9fc5) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #576      +/-   ##
===========================================
- Coverage    86.53%   86.52%   -0.02%     
===========================================
  Files          108      108              
  Lines         8287     8287              
===========================================
- Hits          7171     7170       -1     
- Misses        1116     1117       +1     

Impacted Files	Coverage Δ
src/aspire/basis/fb_2d.py	98.47% <0.00%> (-0.51%)	⬇️

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[janden]

Coverage looks ok. We lose one line of coverage here:

ASPIRE-Python/src/aspire/basis/fb_2d.py

Line 261 in 3223d6c

v = v.asnumpy()

which is fine.

[janden]

Not super proud of how the tests are parameterized, but haven't found a better way to do it with the unittest framework.

[j-c-c]

This is great. It will be nice to drop those hardcoded tests. I just have a few questions for now.

[j-c-c]

This looks good. Just have a couple questions.

[j-c-c]

Looks good!