def test_valid_for_seq_number_all(): eq_(sudoku.valid_for_seq(range(1, 10)), [])
def test_valid_for_seq_number_single(): eq_(sudoku.valid_for_seq([1]), range(2, 10))
def test_valid_for_seq_number_some(): eq_(sudoku.valid_for_seq([1, 5, 7, 9]), [2, 3, 4, 6, 8])
def test_valid_for_seq_none(): eq_(sudoku.valid_for_seq([]), range(1, 10))