TESTS: Hvolschenk fix/unmounting select

[moog16]

tests for #512

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of all the commit author(s), set the cla label to yes (if enabled on your project), and then merge this pull request when appropriate.

[codecov-io]

Codecov Report

Merging #514 into rc0.8.0 will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           rc0.8.0     #514      +/-   ##
===========================================
+ Coverage    96.62%   96.63%   +0.01%     
===========================================
  Files           59       59              
  Lines         1984     1990       +6     
  Branches       235      241       +6     
===========================================
+ Hits          1917     1923       +6     
  Misses          67       67

Impacted Files	Coverage Δ
packages/select/index.js	100% <100%> (ø)	⬆️
packages/checkbox/index.js	89.83% <100%> (+0.17%)	⬆️
packages/text-field/index.js	100% <100%> (ø)	⬆️
packages/radio/index.js	100% <100%> (ø)	⬆️
packages/text-field/icon/index.js	100% <100%> (ø)	⬆️
packages/text-field/helper-text/index.js	100% <100%> (ø)	⬆️

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