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tests.js
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/* Unit tests for sudoku.js
*/
// 95 "difficult" puzzles from http://magictour.free.fr/top95
var TEST_PUZZLES = [
"4.....8.5.3..........7......2.....6.....8.4......1.......6.3.7.5..2.....1.4......",
"52...6.........7.13...........4..8..6......5...........418.........3..2...87.....",
"6.....8.3.4.7.................5.4.7.3..2.....1.6.......2.....5.....8.6......1....",
"48.3............71.2.......7.5....6....2..8.............1.76...3.....4......5....",
"....14....3....2...7..........9...3.6.1.............8.2.....1.4....5.6.....7.8...",
"......52..8.4......3...9...5.1...6..2..7........3.....6...1..........7.4.......3.",
"6.2.5.........3.4..........43...8....1....2........7..5..27...........81...6.....",
".524.........7.1..............8.2...3.....6...9.5.....1.6.3...........897........",
"6.2.5.........4.3..........43...8....1....2........7..5..27...........81...6.....",
".923.........8.1...........1.7.4...........658.........6.5.2...4.....7.....9.....",
"6..3.2....5.....1..........7.26............543.........8.15........4.2........7..",
".6.5.1.9.1...9..539....7....4.8...7.......5.8.817.5.3.....5.2............76..8...",
"..5...987.4..5...1..7......2...48....9.1.....6..2.....3..6..2.......9.7.......5..",
"3.6.7...........518.........1.4.5...7.....6.....2......2.....4.....8.3.....5.....",
"1.....3.8.7.4..............2.3.1...........958.........5.6...7.....8.2...4.......",
"6..3.2....4.....1..........7.26............543.........8.15........4.2........7..",
"....3..9....2....1.5.9..............1.2.8.4.6.8.5...2..75......4.1..6..3.....4.6.",
"45.....3....8.1....9...........5..9.2..7.....8.........1..4..........7.2...6..8..",
".237....68...6.59.9.....7......4.97.3.7.96..2.........5..47.........2....8.......",
"..84...3....3.....9....157479...8........7..514.....2...9.6...2.5....4......9..56",
".98.1....2......6.............3.2.5..84.........6.........4.8.93..5...........1..",
"..247..58..............1.4.....2...9528.9.4....9...1.........3.3....75..685..2...",
"4.....8.5.3..........7......2.....6.....5.4......1.......6.3.7.5..2.....1.9......",
".2.3......63.....58.......15....9.3....7........1....8.879..26......6.7...6..7..4",
"1.....7.9.4...72..8.........7..1..6.3.......5.6..4..2.........8..53...7.7.2....46",
"4.....3.....8.2......7........1...8734.......6........5...6........1.4...82......",
".......71.2.8........4.3...7...6..5....2..3..9........6...7.....8....4......5....",
"6..3.2....4.....8..........7.26............543.........8.15........8.2........7..",
".47.8...1............6..7..6....357......5....1..6....28..4.....9.1...4.....2.69.",
"......8.17..2........5.6......7...5..1....3...8.......5......2..4..8....6...3....",
"38.6.......9.......2..3.51......5....3..1..6....4......17.5..8.......9.......7.32",
"...5...........5.697.....2...48.2...25.1...3..8..3.........4.7..13.5..9..2...31..",
".2.......3.5.62..9.68...3...5..........64.8.2..47..9....3.....1.....6...17.43....",
".8..4....3......1........2...5...4.69..1..8..2...........3.9....6....5.....2.....",
"..8.9.1...6.5...2......6....3.1.7.5.........9..4...3...5....2...7...3.8.2..7....4",
"4.....5.8.3..........7......2.....6.....5.8......1.......6.3.7.5..2.....1.8......",
"1.....3.8.6.4..............2.3.1...........958.........5.6...7.....8.2...4.......",
"1....6.8..64..........4...7....9.6...7.4..5..5...7.1...5....32.3....8...4........",
"249.6...3.3....2..8.......5.....6......2......1..4.82..9.5..7....4.....1.7...3...",
"...8....9.873...4.6..7.......85..97...........43..75.......3....3...145.4....2..1",
"...5.1....9....8...6.......4.1..........7..9........3.8.....1.5...2..4.....36....",
"......8.16..2........7.5......6...2..1....3...8.......2......7..3..8....5...4....",
".476...5.8.3.....2.....9......8.5..6...1.....6.24......78...51...6....4..9...4..7",
".....7.95.....1...86..2.....2..73..85......6...3..49..3.5...41724................",
".4.5.....8...9..3..76.2.....146..........9..7.....36....1..4.5..6......3..71..2..",
".834.........7..5...........4.1.8..........27...3.....2.6.5....5.....8........1..",
"..9.....3.....9...7.....5.6..65..4.....3......28......3..75.6..6...........12.3.8",
".26.39......6....19.....7.......4..9.5....2....85.....3..2..9..4....762.........4",
"2.3.8....8..7...........1...6.5.7...4......3....1............82.5....6...1.......",
"6..3.2....1.....5..........7.26............843.........8.15........8.2........7..",
"1.....9...64..1.7..7..4.......3.....3.89..5....7....2.....6.7.9.....4.1....129.3.",
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2....3.8....9",
".2....5938..5..46.94..6...8..2.3.....6..8.73.7..2.........4.38..7....6..........5",
"9.4..5...25.6..1..31......8.7...9...4..26......147....7.......2...3..8.6.4.....9.",
"...52.....9...3..4......7...1.....4..8..453..6...1...87.2........8....32.4..8..1.",
"53..2.9...24.3..5...9..........1.827...7.........981.............64....91.2.5.43.",
"1....786...7..8.1.8..2....9........24...1......9..5...6.8..........5.9.......93.4",
"....5...11......7..6.....8......4.....9.1.3.....596.2..8..62..7..7......3.5.7.2..",
".47.2....8....1....3....9.2.....5...6..81..5.....4.....7....3.4...9...1.4..27.8..",
"......94.....9...53....5.7..8.4..1..463...........7.8.8..7.....7......28.5.26....",
".2......6....41.....78....1......7....37.....6..412....1..74..5..8.5..7......39..",
"1.....3.8.6.4..............2.3.1...........758.........7.5...6.....8.2...4.......",
"2....1.9..1..3.7..9..8...2.......85..6.4.........7...3.2.3...6....5.....1.9...2.5",
"..7..8.....6.2.3...3......9.1..5..6.....1.....7.9....2........4.83..4...26....51.",
"...36....85.......9.4..8........68.........17..9..45...1.5...6.4....9..2.....3...",
"34.6.......7.......2..8.57......5....7..1..2....4......36.2..1.......9.......7.82",
"......4.18..2........6.7......8...6..4....3...1.......6......2..5..1....7...3....",
".4..5..67...1...4....2.....1..8..3........2...6...........4..5.3.....8..2........",
".......4...2..4..1.7..5..9...3..7....4..6....6..1..8...2....1..85.9...6.....8...3",
"8..7....4.5....6............3.97...8....43..5....2.9....6......2...6...7.71..83.2",
".8...4.5....7..3............1..85...6.....2......4....3.26............417........",
"....7..8...6...5...2...3.61.1...7..2..8..534.2..9.......2......58...6.3.4...1....",
"......8.16..2........7.5......6...2..1....3...8.......2......7..4..8....5...3....",
".2..........6....3.74.8.........3..2.8..4..1.6..5.........1.78.5....9..........4.",
".52..68.......7.2.......6....48..9..2..41......1.....8..61..38.....9...63..6..1.9",
"....1.78.5....9..........4..2..........6....3.74.8.........3..2.8..4..1.6..5.....",
"1.......3.6.3..7...7...5..121.7...9...7........8.1..2....8.64....9.2..6....4.....",
"4...7.1....19.46.5.....1......7....2..2.3....847..6....14...8.6.2....3..6...9....",
"......8.17..2........5.6......7...5..1....3...8.......5......2..3..8....6...4....",
"963......1....8......2.5....4.8......1....7......3..257......3...9.2.4.7......9..",
"15.3......7..4.2....4.72.....8.........9..1.8.1..8.79......38...........6....7423",
"..........5724...98....947...9..3...5..9..12...3.1.9...6....25....56.....7......6",
"....75....1..2.....4...3...5.....3.2...8...1.......6.....1..48.2........7........",
"6.....7.3.4.8.................5.4.8.7..2.....1.3.......2.....5.....7.9......1....",
"....6...4..6.3....1..4..5.77.....8.5...8.....6.8....9...2.9....4....32....97..1..",
".32.....58..3.....9.428...1...4...39...6...5.....1.....2...67.8.....4....95....6.",
"...5.3.......6.7..5.8....1636..2.......4.1.......3...567....2.8..4.7.......2..5..",
".5.3.7.4.1.........3.......5.8.3.61....8..5.9.6..1........4...6...6927....2...9..",
"..5..8..18......9.......78....4.....64....9......53..2.6.........138..5....9.714.",
"..........72.6.1....51...82.8...13..4.........37.9..1.....238..5.4..9.........79.",
"...658.....4......12............96.7...3..5....2.8...3..19..8..3.6.....4....473..",
".2.3.......6..8.9.83.5........2...8.7.9..5........6..4.......1...1...4.22..7..8.9",
".5..9....1.....6.....3.8.....8.4...9514.......3....2..........4.8...6..77..15..6.",
".....2.......7...17..3...9.8..7......2.89.6...13..6....9..5.824.....891..........",
"3...8.......7....51..............36...2..4....7...........6.13..452...........8.."
]
// Solve
// =====
module('Solve');
test("Solve", function(){
var puz1 = [
"52...6.........7.13...........4..8..6......5...........418.........3."+
".2...87.....",
"527316489896542731314987562172453896689271354453698217941825673765134"+
"928238769145"
]
var puz2 = [
"6.....8.3.4.7.................5.4.7.3..2.....1.6.......2.....5.....8."+
"6......1....",
"617459823248736915539128467982564371374291586156873294823647159791385"+
"642465912738"
]
var puz3 = [
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8....9",
"174589362953261784862347951219673845387415296546928173628194537495732"+
"618731856429"
]
var puz_unsolvable =
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8...99";
var puz_unsolvable2 = "5168497323.46.2...5.97...65135.6.9.7472591..696837."+
".5.253186.746842.75..791.5.6.8";
var puz_too_big =
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8....91";
var puz_invalid_chars =
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8..!.9";
// Solve some hard puzzles with known answers
ok(sudoku.solve(puz1[0]) === puz1[1], puz1[0] + " -> " + puz1[1]);
ok(sudoku.solve(puz2[0]) === puz2[1], puz2[0] + " -> " + puz2[1]);
ok(sudoku.solve(puz3[0]) === puz3[1], puz3[0] + " -> " + puz3[1]);
// Solve all 95 difficult puzzles from above without any errors
for(var i in TEST_PUZZLES){
ok(sudoku.solve(TEST_PUZZLES[i]));
}
// Try to solve unsolvable puzzles
ok(!sudoku.solve(puz_unsolvable), "Unsolvable");
ok(!sudoku.solve(puz_unsolvable2), "Unsolvable 2");
// Board too big
throws(function(){sudoku.solve(puz_too_big)}, "Invalid board size");
// Board has invalid character
throws(function(){sudoku.solve(puz_invalid_chars)}, "Invalid characters");
});
test("Get candidates map", function(){
var puz =
"4.....8.5.3..........7......2.....6.....8.4......1.......6.3.7.5..2.."+
"...1.4......";
var puz_candidates = {
"A1": "4", "A2": "1679", "A3": "12679", "A4": "139", "A5": "2369",
"A6": "269", "A7": "8", "A8": "1239", "A9": "5", "B1": "26789",
"B2": "3", "B3": "1256789", "B4": "14589", "B5": "24569",
"B6": "245689", "B7": "12679", "B8": "1249", "B9": "124679",
"C1": "2689", "C2": "15689", "C3": "125689", "C4": "7", "C5": "234569",
"C6": "245689", "C7": "12369", "C8": "12349", "C9": "123469",
"D1": "3789", "D2": "2", "D3": "15789", "D4": "3459", "D5": "34579",
"D6": "4579", "D7": "13579", "D8": "6", "D9": "13789", "E1": "3679",
"E2": "15679", "E3": "15679", "E4": "359", "E5": "8", "E6": "25679",
"E7": "4", "E8": "12359", "E9": "12379", "F1": "36789", "F2": "4",
"F3": "56789", "F4": "359", "F5": "1", "F6": "25679", "F7": "23579",
"F8": "23589", "F9": "23789", "G1": "289", "G2": "89", "G3": "289",
"G4": "6", "G5": "459", "G6": "3", "G7": "1259", "G8": "7",
"G9": "12489",
"H1": "5", "H2": "6789", "H3": "3", "H4": "2", "H5": "479", "H6": "1",
"H7": "69", "H8": "489", "H9": "4689", "I1": "1", "I2": "6789",
"I3": "4", "I4": "589", "I5": "579", "I6": "5789", "I7": "23569",
"I8": "23589", "I9": "23689"
}
var puz_too_big =
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8....91";
var puz_invalid_chars =
".........9......84.623...5....6...453...1...6...9...7....1.....4.5..2"+
"....3.8..!.9";
// Get candidates for puzzle
deepEqual(sudoku._get_candidates_map(puz), puz_candidates, puz);
// Board too big
throws(function(){sudoku._get_candidates_map(puz_too_big)},
"Invalid board size");
// Board has invalid character
throws(function(){sudoku._get_candidates_map(puz_invalid_chars)},
"Invalid characters");
});
test("Get candidates", function(){
deepEqual(
sudoku.get_candidates(
"4.25..389....4.265..523.147..1652.7.6..1945322543876915....3.1....4..9.....8....3"
),[
["4","167","2","5","167","16","3","8","9"],
["13789","13789","3789","79","4","189","2","6","5"],
["89","689","5","2","3","689","1","4","7"],
["389","389","1","6","5","2","48","7","48"],
["6","78","78","1","9","4","5","3","2"],
["2","5","4","3","8","7","6","9","1"],
["5","246789","6789","79","267","3","478","1","468"],
["1378","123678","3678","4","1267","156","9","25","68"],
["179","124679","679","8","1267","1569","47","25","3"]
])
});
// Square relationships
// ====================
module("Square relationships");
test("Get square -> vals map", function(){
var puz =
"4.....8.5.3..........7......2.....6.....8.4......1.......6.3.7.5..2.."+
"...1.4......";
deepEqual(sudoku._get_square_vals_map(puz), {
"A1": "4", "A2": ".", "A3": ".", "A4": ".", "A5": ".", "A6": ".",
"A7": "8", "A8": ".", "A9": "5", "B1": ".", "B2": "3", "B3": ".",
"B4": ".", "B5": ".", "B6": ".", "B7": ".", "B8": ".", "B9": ".",
"C1": ".", "C2": ".", "C3": ".", "C4": "7", "C5": ".", "C6": ".",
"C7": ".", "C8": ".", "C9": ".", "D1": ".", "D2": "2", "D3": ".",
"D4": ".", "D5": ".", "D6": ".", "D7": ".", "D8": "6", "D9": ".",
"E1": ".", "E2": ".", "E3": ".", "E4": ".", "E5": "8", "E6": ".",
"E7": "4", "E8": ".", "E9": ".", "F1": ".", "F2": ".", "F3": ".",
"F4": ".", "F5": "1", "F6": ".", "F7": ".", "F8": ".", "F9": ".",
"G1": ".", "G2": ".", "G3": ".", "G4": "6", "G5": ".", "G6": "3",
"G7": ".", "G8": "7", "G9": ".", "H1": "5", "H2": ".", "H3": ".",
"H4": "2", "H5": ".", "H6": ".", "H7": ".", "H8": ".", "H9": ".",
"I1": "1", "I2": ".", "I3": "4", "I4": ".", "I5": ".", "I6": ".",
"I7": ".", "I8": ".", "I9": "."
}, "Testing with medium puzzle");
throws(function(){sudoku._get_square_vals_map("")},
"Size squares/puzzle size mismatch")
});
test("Get square -> units map", function(){
var rows = "ABCDEFGHI";
var cols = "123456789";
var squares = sudoku._cross(rows, cols);
var units = sudoku._get_all_units(rows, cols);
var square_units_map = sudoku._get_square_units_map(squares, units);
// Check units for A1
deepEqual(square_units_map["A1"], [
["A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9"],
["A1", "B1", "C1", "D1", "E1", "F1", "G1", "H1", "I1"],
["A1", "A2", "A3", "B1", "B2", "B3", "C1", "C2", "C3"]
], "Units for A1");
// Check units for E5
deepEqual(square_units_map["E5"], [
["E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9"],
["A5", "B5", "C5", "D5", "E5", "F5", "G5", "H5", "I5"],
["D4", "D5", "D6", "E4", "E5", "E6", "F4", "F5", "F6"]
], "Units for E5");
});
test("Get square -> peers map", function(){
var rows = "ABCDEFGHI";
var cols = "123456789";
var squares = sudoku._cross(rows, cols);
var units = sudoku._get_all_units(rows, cols);
var square_units_map = sudoku._get_square_units_map(squares, units);
var square_peers_map = sudoku._get_square_peers_map(squares,
square_units_map);
// Check peers for A1
deepEqual(square_peers_map["A1"], [
"A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "B1", "C1", "D1", "E1",
"F1", "G1", "H1", "I1", "B2", "B3", "C2", "C3"],
"Peers for A1");
// Check peers for C2
deepEqual(square_peers_map["C2"], [
"C1", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "A2", "B2", "D2", "E2",
"F2", "G2", "H2", "I2", "A1", "A3", "B1", "B3"],
"Peers for C2");
});
test("Get all units", function(){
var rows = "ABCDEFGHI";
var cols = "123456789";
var all_units = sudoku._get_all_units(rows, cols);
// Make sure we have exactly 27 units (9 rows + 9 columns + 9 boxes)
equal(all_units.length, 27, "27 units");
// Look for the first row unit
deepEqual(all_units[0],
["A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9"],
"First row unit")
// Look for the first col unit
deepEqual(all_units[9],
["A1", "B1", "C1", "D1", "E1", "F1", "G1", "H1", "I1"],
"First col unit")
// Look for the first box unit
deepEqual(all_units[18],
["A1", "A2", "A3", "B1", "B2", "B3", "C1", "C2", "C3"],
"First box unit")
});
// Conversions
// ===========
module("Conversions");
test("Board string -> grid", function(){
var board1 = ".5.1972.8.9.2651.7217483596.4.3..7.9.3.7.98...796..32.981536472325974681764812953";
var board2 = ".1.872.4..47695....651437..4217.8.3..7.2.4...58.9.12746583294171924873..734516...";
var board3 = "23.94.67.8..3259149..76.32.1.....7925.321.4864..68.5317..1....96598721433...9...7";
deepEqual(sudoku.board_string_to_grid(board1), [
[".","5",".","1","9","7","2",".","8"],
[".","9",".","2","6","5","1",".","7"],
["2","1","7","4","8","3","5","9","6"],
[".","4",".","3",".",".","7",".","9"],
[".","3",".","7",".","9","8",".","."],
[".","7","9","6",".",".","3","2","."],
["9","8","1","5","3","6","4","7","2"],
["3","2","5","9","7","4","6","8","1"],
["7","6","4","8","1","2","9","5","3"]
]);
deepEqual(sudoku.board_string_to_grid(board2), [
[".","1",".","8","7","2",".","4","."],
[".","4","7","6","9","5",".",".","."],
[".","6","5","1","4","3","7",".","."],
["4","2","1","7",".","8",".","3","."],
[".","7",".","2",".","4",".",".","."],
["5","8",".","9",".","1","2","7","4"],
["6","5","8","3","2","9","4","1","7"],
["1","9","2","4","8","7","3",".","."],
["7","3","4","5","1","6",".",".","."]
]);
deepEqual(sudoku.board_string_to_grid(board3), [
["2","3",".","9","4",".","6","7","."],
["8",".",".","3","2","5","9","1","4"],
["9",".",".","7","6",".","3","2","."],
["1",".",".",".",".",".","7","9","2"],
["5",".","3","2","1",".","4","8","6"],
["4",".",".","6","8",".","5","3","1"],
["7",".",".","1",".",".",".",".","9"],
["6","5","9","8","7","2","1","4","3"],
["3",".",".",".","9",".",".",".","7"]
]);
});
test("Board grid -> string", function(){
var grid1 = [
[".","5",".","1","9","7","2",".","8"],
[".","9",".","2","6","5","1",".","7"],
["2","1","7","4","8","3","5","9","6"],
[".","4",".","3",".",".","7",".","9"],
[".","3",".","7",".","9","8",".","."],
[".","7","9","6",".",".","3","2","."],
["9","8","1","5","3","6","4","7","2"],
["3","2","5","9","7","4","6","8","1"],
["7","6","4","8","1","2","9","5","3"]
];
var grid2 = [
[".","1",".","8","7","2",".","4","."],
[".","4","7","6","9","5",".",".","."],
[".","6","5","1","4","3","7",".","."],
["4","2","1","7",".","8",".","3","."],
[".","7",".","2",".","4",".",".","."],
["5","8",".","9",".","1","2","7","4"],
["6","5","8","3","2","9","4","1","7"],
["1","9","2","4","8","7","3",".","."],
["7","3","4","5","1","6",".",".","."]
];
var grid3 = [
["2","3",".","9","4",".","6","7","."],
["8",".",".","3","2","5","9","1","4"],
["9",".",".","7","6",".","3","2","."],
["1",".",".",".",".",".","7","9","2"],
["5",".","3","2","1",".","4","8","6"],
["4",".",".","6","8",".","5","3","1"],
["7",".",".","1",".",".",".",".","9"],
["6","5","9","8","7","2","1","4","3"],
["3",".",".",".","9",".",".",".","7"]
];
deepEqual(sudoku.board_grid_to_string(grid1),
".5.1972.8.9.2651.7217483596.4.3..7.9.3.7.98...796..32.981536472325974681764812953"
);
deepEqual(sudoku.board_grid_to_string(grid2),
".1.872.4..47695....651437..4217.8.3..7.2.4...58.9.12746583294171924873..734516..."
);
deepEqual(sudoku.board_grid_to_string(grid3),
"23.94.67.8..3259149..76.32.1.....7925.321.4864..68.5317..1....96598721433...9...7"
);
});
test("Integration", function(){
for(var i = 0; i < 10; ++i){
var board = sudoku.generate();
var board_grid = sudoku.board_string_to_grid(board);
var board_string = sudoku.board_grid_to_string(board_grid);
ok(board === board_string);
}
});
// Utility
// =======
module("Utility");
test("Validate board", function(){
var report_empty = sudoku.validate_board();
var report_invalid_size = sudoku.validate_board("123");
var report_invalid_char = sudoku.validate_board(
".3.9564272..784136764231589327149658.4.56..73..637._14412893765.8.627"+
"341673415892");
var report_good = sudoku.validate_board(
".3.9564272..784136764231589327149658.4.56..73..637..14412893765.8.627"+
"341673415892");
ok(report_empty !== true);
ok(report_invalid_size !== true);
ok(report_invalid_char !== true);
ok(report_good);
});
test("Cross product", function(){
// Simple case
deepEqual(sudoku._cross('a','1'), ["a1"], "Simple case");
// Classic case
deepEqual(
sudoku._cross("abc", "123"),
["a1", "a2", "a3", "b1", "b2", "b3", "c1", "c2", "c3"],
"Classic case"
);
// Empty case
deepEqual(sudoku._cross('',''), [], "Empty case");
// Classic case with arrays
deepEqual(
sudoku._cross(['a', 'b', 'c'], [1, 2, 3]),
["a1", "a2", "a3", "b1", "b2", "b3", "c1", "c2", "c3"],
"Classic case with arrays"
);
// Mismatched size
deepEqual(
sudoku._cross(['a', 'b', 'c'], [1, 2]),
["a1", "a2", "b1", "b2", "c1", "c2"],
"Mismatched size"
);
// Empty default
deepEqual(sudoku._cross(), [], "Empty arrays");
});
test("_in", function(){
var seq = [1, 2, 3];
var seq_string = "abc";
// Normal
ok(sudoku._in(1, seq), "Normal use case");
ok(!sudoku._in(0, seq), "Normal use case (not)");
// String
ok(sudoku._in('a', seq_string), "String");
ok(!sudoku._in('z', seq_string), "String (not)");
});