@Test(expected = IllegalStateException.class)
public void activateActiveVehicle() throws Exception {
// Given
vehicle.applyEvent(new Activated(vehicle.id));
// When
vehicle.activate();
// Should throw IllegalStateException
}
@Test
public void activateVehicleTest() throws Exception {
// When
vehicle.activate();
// Then
List<Event> events = vehicle.getPendingEvents();
assertTrue(events.size() == 1);
assertTrue(events.get(0).equals(new Activated(vehicle.id)));
}