def test_to_left_matches_on_line(self):
val = cr.totheleft([0, 1], [0, 1])
self.assertTrue(val)
def test_to_left_matches_left(self):
val = cr.totheleft([0, 1], [1, 0])
self.assertTrue(val)
def test_to_left_rejects_right(self):
val = cr.totheleft([1, 0], [0, 1])
self.assertFalse(val)
