Support Concatenate dataset for testing

[Johnson-Wang]

No description provided.

[codecov]

Codecov Report

Merging #4452 (88ad83f) into master (2d2e5c6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4452   +/-   ##
=======================================
  Coverage   62.01%   62.01%           
=======================================
  Files         241      241           
  Lines       18350    18350           
  Branches     3074     3074           
=======================================
  Hits        11380    11380           
  Misses       6413     6413           
  Partials      557      557           

Flag	Coverage Δ
unittests	61.97% <ø> (ø)

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