Angular 2 reproducing "... has changed after it was checked. Previous value: ... Current value: ..." exception

This Angular 2 example project demonstrates the investigation how to reproduce the error "... has changed after it was checked. Previous value: ... Current value: ...".

• Note: it's just an example. It's not a general solution scheme.
• Note: the tests are failing. It shows that the same situation can be achieved in the unit test.