[UT] add ut for recognizer 2d

[cir7]

Motivation

[UT] add ut for recognizer 2d

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.08 🎉

Comparison is base (81766c7) 76.99% compared to head (77e73b4) 77.08%.

❗ Current head 77e73b4 differs from pull request most recent head 2110556. Consider uploading reports for the commit 2110556 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2432      +/-   ##
===========================================
+ Coverage    76.99%   77.08%   +0.08%     
===========================================
  Files          159      159              
  Lines        12596    12596              
  Branches      2115     2115              
===========================================
+ Hits          9698     9709      +11     
+ Misses        2391     2386       -5     
+ Partials       507      501       -6     

Flag	Coverage Δ
unittests	77.08% <ø> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
mmaction/testing/__init__.py	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

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