def it_returns_a_collecting_child_before_itself():
group = BaseGroup()
group.add_child(BaseGroup())
group.is_collecting = True
group.children[0].is_collecting = True
assert group.get_collecting_group() == group.children[0]
def it_returns_rightmost_collecting_child():
group = BaseGroup()
group.add_child(BaseGroup())
group.add_child(BaseGroup())
group.children[0].is_collecting = True
group.children[1].is_collecting = True
assert group.get_collecting_group() == group.children[1]
def it_returns_own_group_if_it_is_collecting_and_has_no_children():
group = BaseGroup()
group.is_collecting = True
assert group.get_collecting_group() == group
