def test_is_valid_space_out_of_range():
"""Check that a position outside the range of the board array is classified
as invalid.
"""
board = Board()
assert not board.is_valid_space((7, 2))
def test_is_valid_space_valid():
"""Check that a valid space on a base 4 board isn't misclassified as an
invalid space.
"""
board = Board()
assert board.is_valid_space((3, 3))
def test_is_valid_space_invalid():
"""Check that all invalid spaces on a base 4 board are correctly identified
as invalid.
"""
board = Board()
invalid_spaces = [(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (2, 0), (4, 6),
(5, 5), (5, 6), (6, 4), (6, 5), (6, 6)]
for space in invalid_spaces:
assert not board.is_valid_space(space)