Put loose test into a describe block where it belongs...

[acinader]

1. prefer const since i am touching the file.
2. move a test that was outside its describe where it belongs.

this is really a no-op style pr since i am touching file for another issue....

[codecov]

Codecov Report

Merging #3920 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3920      +/-   ##
==========================================
+ Coverage   90.24%   90.25%   +0.01%     
==========================================
  Files         114      114              
  Lines        7584     7584              
==========================================
+ Hits         6844     6845       +1     
+ Misses        740      739       -1

Impacted Files	Coverage Δ
src/RestWrite.js	93.32% <0%> (+0.19%)	⬆️

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