Add tests for _fft_c2r function.

[fatcat-z]

Create custom tests of _fft_c2r() to help evaluating the fix to it in torch_lib. Fail them because the function doesn't work well yet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2e22077) 78.68% compared to head (f52ff11) 78.23%.

❗ Current head f52ff11 differs from pull request most recent head 3d11fbf. Consider uploading reports for the commit 3d11fbf to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1198      +/-   ##
==========================================
- Coverage   78.68%   78.23%   -0.46%     
==========================================
  Files         118      118              
  Lines       15436    15443       +7     
  Branches     2424     2426       +2     
==========================================
- Hits        12146    12082      -64     
- Misses       2892     2966      +74     
+ Partials      398      395       -3     

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[justinchuby]

Thanks! I think I saw PyTorch errors with the test examples. Was there any test cases that need to be adjusted?