Refactor unit test

[hhaAndroid]

Refactor unit test

[codecov]

Codecov Report

Merging #4600 (6fab54d) into master (272f200) will decrease coverage by 0.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4600      +/-   ##
==========================================
- Coverage   64.31%   63.75%   -0.56%     
==========================================
  Files         252      251       -1     
  Lines       19270    19297      +27     
  Branches     3252     3265      +13     
==========================================
- Hits        12393    12303      -90     
- Misses       6231     6338     +107     
- Partials      646      656      +10     

Flag	Coverage Δ
unittests	63.75% <ø> (-0.53%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/core/mask/structures.py	76.30% <0.00%> (-11.57%)	⬇️
mmdet/models/roi_heads/test_mixins.py	42.74% <0.00%> (-10.69%)	⬇️
mmdet/models/dense_heads/rpn_test_mixin.py	77.41% <0.00%> (-6.46%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.44% <0.00%> (-5.56%)	⬇️
mmdet/core/bbox/coder/base_bbox_coder.py	75.00% <0.00%> (-5.00%)	⬇️
mmdet/models/roi_heads/base_roi_head.py	76.31% <0.00%> (-3.69%)	⬇️
mmdet/core/evaluation/eval_hooks.py	51.70% <0.00%> (-3.14%)	⬇️
mmdet/models/detectors/base.py	52.80% <0.00%> (-2.51%)	⬇️
mmdet/models/detectors/htc.py	87.50% <0.00%> (-1.39%)	⬇️
... and 54 more

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[ZwwWayne]

kindly ping @jshilong