Low level keyboard tests

[antonov-andrey144]

No description provided.

[codecov-commenter]

Codecov Report

Merging #78 (87dd15e) into master (6342300) will decrease coverage by 0.17%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #78      +/-   ##
============================================
- Coverage     22.50%   22.33%   -0.18%     
  Complexity       49       49              
============================================
  Files           152      153       +1     
  Lines          3986     4030      +44     
  Branches        543      545       +2     
============================================
+ Hits            897      900       +3     
- Misses         3068     3109      +41     
  Partials         21       21              

Impacted Files	Coverage Δ
.../projector/common/protocol/toClient/ServerEvent.kt	13.54% <0.00%> (-0.18%)	⬇️
...rg/jetbrains/projector/client/web/window/Window.kt	0.00% <0.00%> (ø)
...etbrains/projector/client/web/state/ClientState.kt	0.00% <0.00%> (ø)
...tbrains/projector/client/web/speculative/Typing.kt	0.00% <0.00%> (ø)
...rains/projector/client/web/window/WindowManager.kt	0.00% <0.00%> (ø)
...jetbrains/projector/agent/ijInjector/IjInjector.kt	0.00% <0.00%> (ø)
...s/projector/client/web/input/key/ImeInputMethod.kt	35.71% <0.00%> (ø)
...ns/projector/common/protocol/handshake/Constant.kt	100.00% <0.00%> (ø)
...ns/projector/client/common/misc/ImageCacherTest.kt	100.00% <0.00%> (ø)
...tor/client/web/window/WindowDataEventsProcessor.kt	0.00% <0.00%> (ø)
... and 3 more

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[SerVB]

Please request my review before merging. For now I'm going out of this PR to clean the list of pending PRs a bit :)