Tests/work tests

[zorkow]

• Adds tests for worker structure.
• Simplifies structure computation if braille or speech is not switched on.

[codecov]

Codecov Report

❌ Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.61%. Comparing base (17076f0) to head (fd12dc3).
⚠️ Report is 14 commits behind head on develop.

Files with missing lines	Patch %	Lines
ts/common/processor_factory.ts	38.46%	8 Missing ⚠️
ts/common/dom_util.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #837      +/-   ##
===========================================
+ Coverage    91.57%   92.61%   +1.03%     
===========================================
  Files          165      165              
  Lines        40224    40237      +13     
  Branches      4310     4418     +108     
===========================================
+ Hits         36837    37266     +429     
+ Misses        3387     2971     -416     

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