ENH: try to increase coverage

[qianduoduo0904]

What do these changes do?

Related issue number

Fixes #xxxx

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass

[codecov]

Codecov Report

Merging #5 (4c8c295) into main (50f9b65) will increase coverage by 12.44%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main       #5       +/-   ##
===========================================
+ Coverage   79.76%   92.20%   +12.44%     
===========================================
  Files          54       49        -5     
  Lines        4532     3888      -644     
  Branches      849      750       -99     
===========================================
- Hits         3615     3585       -30     
+ Misses        840      219      -621     
- Partials       77       84        +7     

Flag	Coverage Δ
unittests	92.05% <ø> (+12.37%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/xoscar/aio/__init__.py	100.00% <ø> (ø)
python/xoscar/aio/lru.py
python/xoscar/nvutils.py
python/xoscar/entrypoints.py
python/xoscar/backends/communication/ucx.py	66.39% <0.00%> (+30.29%)	⬆️
python/xoscar/backends/communication/utils.py	100.00% <0.00%> (+46.15%)	⬆️
python/xoscar/serialization/cuda.py	84.37% <0.00%> (+57.81%)	⬆️
python/xoscar/serialization/arrow.py	100.00% <0.00%> (+64.28%)	⬆️

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[aresnow1]

LGTM