def test_generate_end_position():
# Arrange
puzzle = Puzzle()
# Act
end_position = puzzle._Puzzle__generate_end_position()
# Assert - Should generate the solved position of the puzzle
expected_end_position = np.array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
[13, 14, 15, 0]])
assert np.array_equal(end_position, expected_end_position)
