def test_cell_set_symbol_illegal2(alphabet):
cell = Cell(0, 0, alphabet)
with pytest.raises(SymbolNotPossible):
cell.set_symbol('a')
def test_cell_set_symbol_legal_at_first_time(alphabet):
cell = Cell(0, 0, alphabet)
cell.set_symbol('1')
with pytest.raises(SymbolNotPossible):
cell.set_symbol('2')
