def test_solve4(self):
board = SudokuBoard([[2, 0, 0, 3], [0, 0, 0, 2], [0, 3, 1, 0],
[4, 0, 0, 0]])
assert board.solve() == None
def test_solve(self):
board = SudokuBoard([[0, 0, 0, 3], [0, 0, 0, 2], [3, 0, 0, 0],
[4, 0, 0, 0]])
solved = board.solve(SearchSolver())
expected = '\n'.join(['2413', '1342', '3124', '4231'])
assert str(solved) == expected
def test_solve2(self):
board = SudokuBoard([[4, 1, 2, 3], [2, 3, 4, 1], [3, 4, 1, 2],
[0, 0, 0, 0]])
solved = board.solve()
expected = '\n'.join(['4123', '2341', '3412', '1234'])
assert str(solved) == expected
