Added validations, tests, fixed bug.

[gustaafj]

🚨 Please review the guidelines for contributing to this repository.

Small change to the README, added validation for the subscriberVisibility and publisherVisibility and their roles. Fixed a bug in e2e.test.js when validating the result of invalid testcases. Added and updated e2e-testcases

• [ ] Updated unit tests (*.spec.js)
• [x] Updated e2e tests (here)
• [x] Updated documentation (here)

🙌 Thank you!

[codecov-commenter]

Codecov Report

Merging #101 (e289b7f) into main (acc2245) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #101   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files           3        3           
  Lines         590      590           
  Branches       70       70           
=======================================
  Hits          481      481           
  Misses         95       95           
  Partials       14       14           

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