def test_caret_will_not_drop_past_item_depth(self) -> None:
"""Raise error before dropping caret past item_depth"""
inst = DepthCollector(3) # at depth 1
inst.drop_caret() # at depth 2
inst.drop_caret() # at depth 3 (item_depth)
with pytest.raises(CaretDepthError):
inst.drop_caret()
def test_raise_caret(self) -> None:
"""Reduce caret list by one."""
inst = DepthCollector(3) # caret = [[]]
inst.drop_caret()
assert inst.rightmost_branches == [[[]], []]
inst.raise_caret()
assert inst.rightmost_branches == [[[]]]
def test_last_caret(self) -> None:
"""Add empty list to caret[-1]. Append pointer to new list to caret. """
inst = DepthCollector(3)
inst.drop_caret()
assert inst.rightmost_branches == [[[]], []]
assert inst.rightmost_branches[-1] is inst.rightmost_branches[-2][-1]