def test_empty_bst_with_postorder_yields_empty_list():
"""Test if empty tree yields empty list."""
from bst import Tree
empty_tree = Tree()
empty_gen = empty_tree.postorder()
assert [n for n in empty_gen] == []
def test_empty_bst_with_postorder_yields_empty_list():
"""Test if empty tree yields empty list."""
from bst import Tree
empty_tree = Tree()
empty_gen = empty_tree.postorder()
assert [n for n in empty_gen] == []
