def test_it_exists(self):
cell = Cell("B4")
self.assertEqual(cell.coordinate, "B4")
self.assertEqual(cell.ship, None)
self.assertEqual(cell.isEmpty(), True)
def test_place_ship(self):
cell = Cell("B4")
cruiser = Ship("Cruiser", 3)
cell.place_ship(cruiser)
self.assertEqual(cell.ship, cruiser)
self.assertEqual(cell.isEmpty(), False)