def test_can_write_empty_cell_in_the_middle():
cells = RowCells([1, 2, 3, None, 5])
cells[3] = 'test'
assert cells[3] == 'test'
assert cells[4] == 5
def test_can_write_any_cell():
cells = RowCells()
cells[0] = 'test'
assert cells[0] == 'test'
cells[10] = 'test'
assert cells[10] == 'test'
def test_empty_cell_before_and_after(self):
cells = RowCells([1, None, 3, None, 5])
assert cells.next_empty_cell(3) == 3
def test_empty_cell_in_the_middle_from_the_middle(self):
cells = RowCells([1, 4, 3, None, 5])
assert cells.next_empty_cell(3) == 3
def test_empty_row():
cells = RowCells()
assert cells == []
def test_list_with_values(self):
cells = RowCells([1, 4, 3, 5])
assert cells.next_empty_cell(0) == 4
def test_empty_list(self):
cells = RowCells()
assert cells.next_empty_cell(0) == 0
def test_can_iterate():
cells = RowCells([1, 2, 3])
assert list(cells)
def test_cannot_write_in_filled_cell():
cells = RowCells([1, 2, 3, 4, 5])
with pytest.raises(ImmutableCellError):
cells[3] = 'test'
def test_can_read_any_empty_cell():
cells = RowCells()
assert cells[0] is None
assert cells[10] is None
assert cells[100] is None