Typical lifecycle of PatternTestInstanceState:

• The PatternTestController creates a PatternTestInstanceState for the instance of the PatternTest to be executed using particular data bindings.
• The controller populates the instance state with slot values for each slot with an associated IDataAccessor in the PatternTestState.
• The controller calls BeforeTestInstanceChain to give test extensions the opportunity to modify the instance state.
• The controller initializes, sets up, executes, tears down and disposes the test instance.
• The controller calls AfterTestInstanceChain to give test extensions the opportunity to clean up the instance state.