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[yanyongyu]

resolve #1445

[codecov]

Codecov Report

Merging #1446 (091287d) into master (723eef1) will not change coverage.
The diff coverage is n/a.

❗ Current head 091287d differs from pull request most recent head 759520e. Consider uploading reports for the commit 759520e to get more accurate results

@@           Coverage Diff           @@
##           master    #1446   +/-   ##
=======================================
  Coverage   85.70%   85.70%           
=======================================
  Files          44       44           
  Lines        3309     3309           
=======================================
  Hits         2836     2836           
  Misses        473      473           

Flag	Coverage Δ
unittests	85.70% <ø> (ø)

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