add unittests for LAMMPS pair deepmd

[njzjz]

No description provided.

[codecov-commenter]

Codecov Report

Base: 75.71% // Head: 73.56% // Decreases project coverage by -2.14% ⚠️

Coverage data is based on head (3dbe7e3) compared to base (6733a06).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1977      +/-   ##
==========================================
- Coverage   75.71%   73.56%   -2.15%     
==========================================
  Files         191      198       +7     
  Lines       18695    19915    +1220     
  Branches      854      854              
==========================================
+ Hits        14154    14651     +497     
- Misses       4153     4876     +723     
  Partials      388      388              

Impacted Files	Coverage Δ
deepmd/entrypoints/main.py	90.83% <ø> (+3.33%)	⬆️
deepmd/entrypoints/convert.py	60.00% <100.00%> (+44.61%)	⬆️
source/op/prod_force_grad_multi_device.cc	90.51% <0.00%> (-6.37%)	⬇️
source/op/prod_virial_grad_multi_device.cc	91.50% <0.00%> (-5.72%)	⬇️
source/op/soft_min_force_grad.cc	93.93% <0.00%> (-4.48%)	⬇️
source/op/soft_min_virial_grad.cc	94.59% <0.00%> (-4.00%)	⬇️
source/op/prod_force_grad.cc	77.47% <0.00%> (-2.90%)	⬇️
source/op/prod_virial_grad.cc	79.33% <0.00%> (-2.72%)	⬇️
source/lib/include/SimulationRegion.h	25.00% <0.00%> (-2.28%)	⬇️
source/api_cc/src/common.cc	85.46% <0.00%> (-0.99%)	⬇️
... and 15 more

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[njzjz]

This PR is ok. More tests can be added in the coming PRs.