fix dp test atomic polar; add UTs for dp test

[njzjz]

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[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: +0.63% 🎉

Comparison is base (b38a8fc) 78.67% compared to head (76e4eec) 79.30%.
Report is 1 commits behind head on devel.

❗ Current head 76e4eec differs from pull request most recent head af172e7. Consider uploading reports for the commit af172e7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2785      +/-   ##
==========================================
+ Coverage   78.67%   79.30%   +0.63%     
==========================================
  Files         244      244              
  Lines       25813    25820       +7     
  Branches     1519     1519              
==========================================
+ Hits        20308    20477     +169     
+ Misses       5114     4950     -164     
- Partials      391      393       +2     

Files Changed	Coverage Δ
deepmd/entrypoints/test.py	50.82% <50.00%> (+42.98%)	⬆️

... and 3 files with indirect coverage changes

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