def test_get_coordinates():
# Arrange
puzzle = Puzzle()
puzzle.position = np.array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
[13, 14, 15, 0]])
# Assert
assert puzzle._Puzzle__get_coordinates(1) == (0, 0)
assert puzzle._Puzzle__get_coordinates(4) == (0, 3)
assert puzzle._Puzzle__get_coordinates(13) == (3, 0)
assert puzzle._Puzzle__get_coordinates(0) == (3, 3)
