fix(test): clientHeight unit test

[ghost]

I originally tried to fix another issue, but there was a problem with the test code.
Height varies depending on browser.
For example, height is "19" in my browser.
So I compare it with real DOM's height.

Please check :)

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[ghost]

I signed it!

[googlebot]

CLAs look good, thanks!

[codecov-io]

Codecov Report

Merging #668 into rc0.10.0 will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           rc0.10.0     #668   +/-   ##
=========================================
  Coverage     94.81%   94.81%           
=========================================
  Files            68       68           
  Lines          2852     2852           
  Branches        431      431           
=========================================
  Hits           2704     2704           
  Misses           51       51           
  Partials         97       97

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[moog16]

@TroyTae can you please merge rc0.10.0 branch into your branch and push? It'll kick off the tests

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[ghost]

@moog16
I complete to merge with rc0.10.0 branch.
Should I do this my every PR in the future?

[moog16]

@TroyTae yes please merge to the latest rcX.0 branch. Next will be rc0.11.0

[moog16]

merged - signed in #668 (comment). PR tests passin gin #673