Add setup of preconditions in FSM test using previous states directly

As it is done in testGameState, all preconditions can be setup by using previous states code directly. This is error-proof, as the previous states are also covered by unit tests.

This is done in testGameState this way, and could be done in testDeadState in a similar way.

Compare the existing precondition setup in testGameState with the setup in testDeadState. Reuse the previous-states approach in testDeadState, then run the FSM tests and confirm that the test still reaches the intended dead state without manually duplicating preconditions.

Written by the indexing model from the issue text.