Add an isInBeforeEventState method to the events

We beleive that an event should make a difference in the system before it starts.

Therefore we need to implement:
* An implementable isInBeforeEventState
* A Test for events (#190 ):.

isInBeforeEvent is called after teardown to check if the event has successfully been torn down.

TestEvent can e called (not compulsary) for an event. it will sequentially run
* isInBeforeEventState
* startEvent
* waitTillFinished
* teardown
* isInBeforeEventState

Locate the event implementations and the TestEvent flow described in the issue. Read how event lifecycle methods are currently defined, then add the before-state contract and cover the sequence of checking state, starting, waiting, tearing down, and checking again. Done means the event tests verify the before-state behavior before and after teardown.

Written by the indexing model from the issue text.