Update jest to version 27

[jnt0r]

531 failed because Jest 27 changed default testEnvironment from jsdom to node. So DOM related elements like window or document are not accessible by default anymore.

see: https://jestjs.io/docs/configuration#testenvironment-string

Updated jest and set testEnvironment to jsdom for all tests so they are working again.

[codecov[bot]]

Codecov Report

Merging #533 (5dc7e6a) into master (8f65e08) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #533   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          131       131           
  Branches        21        21           
=========================================
  Hits           131       131           

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[probil]

Awesome @jnt0r ! 🎉