def testRemoveExit(self):
cell = Cell()
cell.addExit(1, 0)
cell.removeExit(1, 0)
self.assertFalse(cell.hasExit(1, 0))
def testAddOpposite(self):
cell = Cell()
cell.addExit(1, 0)
with self.assertRaises(InvalidExitError) as result:
cell.addExit(-1, 0)
self.assertEqual('Invalid exit (-1, 0) when (1, 0) is present.',
result.exception.message)
def testAddExit(self):
cell = Cell()
cell.addExit(1, 0)
self.assertTrue(cell.hasExit(1, 0))
self.assertFalse(cell.hasExit(-1, 0))
