def test_reduce_puzzle_fail() -> None:
"""Given an empty board reduce will fail and return none"""
board_string = '.' * SB.num_boxes()
board = SB.grid_values(board_string)
sbrd = SB()
solution = sbrd.reduce_puzzle(board)
assert solution is None
def test_validate_fail() -> None:
"""Validation function correctly fails on incomplete board"""
board_string = ('4.....8.5.3..........7......2.....6.....8.4......1.......'
'6.3.7.5..2.....1.4......')
board = SB.grid_values(board_string)
sbrd = SB()
solution = sbrd.reduce_puzzle(board)
valid = sbrd.validate(solution)
assert valid is False
def test_validate() -> None:
"""Validation function correctly validates complete board"""
board_string = ('..3.2.6..9..3.5..1..18.64....81.29..7.......8..67.82..'
'..26.95..8..2.3..9..5.1.3..')
board = SB.grid_values(board_string)
sbrd = SB()
solution = sbrd.reduce_puzzle(board)
valid = sbrd.validate(solution)
assert valid is True
def test_reduce_puzzle() -> None:
"""Ensure board state after recursive reduce is correct"""
board_string = ('..3.2.6..9..3.5..1..18.64....81.29..7.......8..67.82..'
'..26.95..8..2.3..9..5.1.3..')
expected_string = ('4,8,3,9,2,1,6,5,7,9,6,7,3,4,5,8,2,1,2,5,1,8,7,6,4,9,3,'
'5,4,8,1,3,2,9,7,6,7,2,9,5,6,4,1,3,8,1,3,6,7,9,8,2,4,5,'
'3,7,2,6,8,9,5,1,4,8,1,4,2,5,3,7,6,9,6,9,5,4,1,7,3,8,2')
board = SB.grid_values(board_string)
sbrd = SB()
solution = sbrd.reduce_puzzle(board)
solution_string = sbrd.board_to_str(solution)
assert solution_string == expected_string
def test_sorted_box_possibilities() -> None:
"""Ensure order of sorted box possibilities with given reduced board"""
board_string = ('4.....8.5.3..........7......2.....6.....8.4......1.......'
'6.3.7.5..2.....1.4......')
expected_sort = ['G2', 'H7', 'A4', 'A6', 'E4', 'F4', 'G1', 'G3', 'G5',
'H5', 'H8', 'I4', 'I5', 'A2', 'A5', 'A8', 'B8', 'C1',
'D1', 'D4', 'D6', 'E1', 'G7', 'H2', 'H9', 'I2', 'I6',
'A3', 'B1', 'B4', 'B5', 'B7', 'C2', 'C7', 'C8', 'D3',
'D5', 'D7', 'D9', 'E2', 'E3', 'E6', 'E8', 'E9', 'F1',
'F3', 'F6', 'F7', 'F8', 'F9', 'G9', 'I7', 'I8', 'I9',
'B6', 'B9', 'C3', 'C5', 'C6', 'C9', 'B3']
board = SB.grid_values(board_string)
sbrd = SB()
reduced = sbrd.reduce_puzzle(board)
SB.display(reduced)
sorted_boxes = SB.sorted_box_possibilities(reduced)
assert sorted_boxes == expected_sort
def test_reduce_puzzle_incomplete() -> None:
"""Ensure given a more complex puzzle reduce terminates incomplete"""
board_string = ('4.....8.5.3..........7......2.....6.....8.4......1.......'
'6.3.7.5..2.....1.4......')
expected_string = ('4,1679,12679,139,2369,269,8,1239,5,26789,3,1256789,'
'14589,24569,245689,12679,1249,124679,2689,15689,'
'125689,7,234569,245689,12369,12349,123469,3789,2,'
'15789,3459,34579,4579,13579,6,13789,3679,15679,15679,'
'359,8,25679,4,12359,12379,36789,4,56789,359,1,25679,'
'23579,23589,23789,289,89,289,6,459,3,1259,7,12489,5,'
'6789,3,2,479,1,69,489,4689,1,6789,4,589,579,5789,'
'23569,23589,23689')
board = SB.grid_values(board_string)
sbrd = SB()
solution = sbrd.reduce_puzzle(board)
solution_string = sbrd.board_to_str(solution)
assert solution_string == expected_string
