Feature improve test coverage

[codecov[bot]]

Codecov Report

Merging #44 (2df9690) into main (4defbdc) will increase coverage by 0.91%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   89.02%   89.93%   +0.91%     
==========================================
  Files          17       17              
  Lines        6359     6300      -59     
==========================================
+ Hits         5661     5666       +5     
+ Misses        698      634      -64     

Impacted Files	Coverage Δ
pygmtools/jittor_backend.py	93.77% <ø> (-0.46%)	:arrow_down:
pygmtools/numpy_backend.py	94.63% <ø> (-0.46%)	:arrow_down:
pygmtools/pytorch_backend.py	94.36% <ø> (-0.01%)	:arrow_down:
pygmtools/jittor_modules.py	95.83% <100.00%> (+12.14%)	:arrow_up:
pygmtools/linear_solvers.py	78.94% <100.00%> (+1.48%)	:arrow_up:
pygmtools/numpy_modules.py	85.98% <100.00%> (+6.40%)	:arrow_up:
pygmtools/pytorch_modules.py	95.79% <100.00%> (+12.22%)	:arrow_up:
pygmtools/utils.py	84.13% <100.00%> (+0.16%)	:arrow_up:
pygmtools/paddle_backend.py	93.85% <0.00%> (-0.64%)	:arrow_down:
... and 6 more

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