State Pattern

class StatePatternDslTest extends GroovyTestCase {
	    private fsm

	    protected void setUp() {
        fsm = FiniteStateMachine.newInstance('offline')
        def recorder = fsm.record()
        recorder.on('connect').from('offline').to('online')
        recorder.on('disconnect').from('online').to('offline')
        recorder.on('send_message').from('online').to('online')
        recorder.on('receive_message').from('online').to('online')
    }

    void testInitialState() {
        assert fsm.isState('offline')
    }
    
    void testOfflineState() {
        shouldFail{
            fsm.fire('send_message')
        }
        shouldFail{
            fsm.fire('receive_message')
        }
        shouldFail{
            fsm.fire('disconnect')
        }
        assert 'online' == fsm.fire('connect')        
    }
    
    void testOnlineState() {
        fsm.fire('connect')
        fsm.fire('send_message')
        fsm.fire('receive_message')
        shouldFail{
            fsm.fire('connect')
        }
        assert 'offline' == fsm.fire('disconnect')        
    }
}