def test_cannot_insert_number_if_it_is_already_on_same_column(self):
grid = create_zero_grid()
col = 3
number = 8
grid[col][2] = number
solver = SudokuSolver(grid)
self.assertFalse(solver._is_possible(col,4,number))
# ok for neighbor col
self.assertTrue(solver._is_possible(col + 1, 4 ,number))
def test_cannot_insert_number_if_it_is_already_on_same_row(self):
grid = create_zero_grid()
row = 3
number = 8
grid[2][row] = number
solver = SudokuSolver(grid)
self.assertFalse(solver._is_possible(4,row,number))
# ok for neighbor row
self.assertTrue(solver._is_possible(4,row + 1,number))
def test_cannot_insert_number_if_it_is_already_on_same_block(self):
grid = create_zero_grid()
number = 8
grid[1][1] = number
grid[4][4] = number
grid[7][7] = number
solver = SudokuSolver(grid)
self.assertFalse(solver._is_possible(2,2,number))
self.assertFalse(solver._is_possible(5,5,number))
self.assertFalse(solver._is_possible(8,8,number))
def test_all_positions_and_numbers_are_possible_on_zero_grid(self):
grid = create_zero_grid()
solver = SudokuSolver(grid)
for number in range(1, 10):
for col in range(9):
for row in range(9):
self.assertTrue(solver._is_possible(col,row,number))
