Use jest for tests

What needs to be changed?

Jest should be used instead of jasmine+karma

How is the current state not sufficient?

It is ok, but with jest it is easier and faster to write tests (great documentation and community, many helpful methods)

Which changes are necessary?

1. make jest instead of karma as tests executor
2. make test code adjustments where needed

Do the proposed changes impact current use cases?

No. Only require relative minor tests adjustments.

Edit: Sent to Backlog, as it requires additional time for setup which is not trivial now.