Get rid of warnings in resampler tests

[pnuu]

This PR adjusts the resamplers so that the tests do not issue any warnings.

Also warning from import gradient search is handled. This is not visible in the tests, but I've seen this in real usage.

• Tests added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (338817d) 95.32% compared to head (1bb5655) 95.32%.
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2681      +/-   ##
==========================================
- Coverage   95.32%   95.32%   -0.01%     
==========================================
  Files         371      371              
  Lines       52435    52398      -37     
==========================================
- Hits        49982    49946      -36     
+ Misses       2453     2452       -1     

Flag	Coverage Δ
behaviourtests	4.16% <11.11%> (-0.01%)	⬇️
unittests	95.93% <100.00%> (-0.01%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 7209266780

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
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A quick fix for this PR: rebase it; your next report should be accurate.

• 9 of 9 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.001%) to 95.885%

---

Totals
Change from base Build 7180375207:	-0.001%
Covered Lines:	50072
Relevant Lines:	52221

---

💛 - Coveralls

[djhoese]

The module docstring still uses the class. If it shouldn't, could you update it to point to this function too?

[pnuu]

Thanks for spotting this! Fixed in 1bb5655

[djhoese]

I made one comment about the docstring. Besides that this looks good to go. Thanks!