def test_node_remove_children_sequentially():
"""Test removing children one after the other"""
parent = TreeNode("test")
child1 = TreeNode("test1")
child2 = TreeNode("test2")
parent.add_children(child1, child2)
assert parent.children[0] is child1
assert parent.children[1] is child2
assert child1.parent is parent
assert child2.parent is parent
parent.drop_children(child1)
assert len(parent.children) == 1
assert child1.parent is None
assert parent.children[0] is child2
assert child2.parent is parent
parent.drop_children(child2)
assert len(parent.children) == 0
assert child1.parent is None
assert child2.parent is None
def test_node_remove_child():
"""Test removing child"""
parent = TreeNode("test")
child = TreeNode("test")
parent.add_children(child)
assert child.parent is parent
assert parent.children[0] is child
parent.drop_children(child)
assert len(parent.children) == 0
assert child.parent is None
def test_node_remove_all_children():
"""Test drop_children() drops all of them"""
parent = TreeNode("test")
child1 = TreeNode("test1")
child2 = TreeNode("test2")
parent.add_children(child1, child2)
assert parent.children[0] is child1
assert parent.children[1] is child2
assert child1.parent is parent
assert child2.parent is parent
parent.drop_children()
assert len(parent.children) == 0
assert child1.parent is None
assert child2.parent is None
def test_node_remove_children_in_batch():
"""Test removing children all at the same time"""
parent = TreeNode("test")
child1 = TreeNode("test1")
child2 = TreeNode("test2")
parent.add_children(child1, child2)
assert parent.children[0] is child1
assert parent.children[1] is child2
assert child1.parent is parent
assert child2.parent is parent
parent.drop_children(child1, child2)
assert len(parent.children) == 0
assert child1.parent is None
assert child2.parent is None