def test_get_vector_static_function(self):
self.assertEqual([0, 0], ChessBoard._get_vector([4, 5], [4, 5]),
'expected NULL vector')
self.assertEqual([0, 1], ChessBoard._get_vector([0, 0], [0, 1]),
'expected positive X')
self.assertEqual([0, -1], ChessBoard._get_vector([0, 1], [0, 0]),
'expected negative Y')
self.assertEqual([1, 1], ChessBoard._get_vector([4, 5], [5, 6]),
'expected ')
self.assertEqual([-1, -1], ChessBoard._get_vector([4, 5], [3, 4]),
'expected both negative')
self.assertEqual([-7, -7], ChessBoard._get_vector([7, 7], [0, 0]),
'expected negative in both')
self.assertEqual([1, 2], ChessBoard._get_vector([1, 2], [2, 4]),
'expected negative in both')
self.assertEqual([0, 5], ChessBoard._get_vector([1, 2], [1, 7]),
'expected negative in both')
