Merge branch '276-introduction-tests' into 'master'

Unit Tests for the Introduction Client

Please note that I based this MR is on top of the introduction UI in !122, because I needed to do some more refactoring on top of the other refactoring ;) The refactoring and the tests are in two separate commits.

An integration test will be added as a separate MR.

This addresses part of #276.

See merge request !136