Add setup of preconditions in FSM test using previous states directly

[David-Estevez]

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.

[PeterBowman]

@David-Estevez could you take a look here and check whether this issue has been resolved since then? The snapshot of the unit tests directory at the time of opening this is: https://github.com/asrob-uc3m/robotDevastation/tree/8eb14b2/test.

[David-Estevez]

Checking testDeadState.cpp, lines 139-146:

robotDevastation/test/testDeadState.cpp

Lines 139 to 147 in 8eb14b2

	//-- Finish setup of the modules that start at game state:
	//-- Note: we can change this to use GameState (as previously) if we want someday
	mockupImageManager->start();
	listener = new MockupInputEventListener;
	mockupInputManager->addInputEventListener(listener);
	audioManager->start();
	audioManager->play("RD_THEME", -1);
	mockupRobotManager->setEnabled(true);

it seems that this has not been solved yet.