add segmented-control test, ref #1274

[silentcloud]

This change is 

[codecov]

Codecov Report

Merging #1511 into master will increase coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1511      +/-   ##
==========================================
+ Coverage   64.86%   65.34%   +0.48%     
==========================================
  Files         229      229              
  Lines        2271     2271              
  Branches      699      699              
==========================================
+ Hits         1473     1484      +11     
+ Misses        797      786      -11     
  Partials        1        1

Flag	Coverage Δ
#rn	79.81% <ø> (ø)	⬆️
#web	64.61% <ø> (+0.5%)	⬆️

Impacted Files	Coverage Δ
components/segmented-control/index.web.tsx	87.17% <0%> (+28.2%)	⬆️

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