@Test
	public void blueUnitCannotDestroyAnotherBlueUnit()
	{
		//check failed combat

		game.createUnit(new Position(5, 5), GameConstants.ARCHER, Player.BLUE);
		Unit u = game.getUnitAt(new Position(5, 5));

		game.createUnit(new Position(6, 5), GameConstants.ARCHER, Player.BLUE);

		game.moveUnit(new Position(5, 5), new Position(6, 5));

		assertNotNull("Some unit at old position", game.getUnitAt(new Position(5,5)));

		assertEquals("Unit did not move", u, game.getUnitAt(new Position(5, 5)));	 
	}