def test_breadth_first_traversal():
"""Test breadth_first traversal."""
from bst import Tree
test_list = [10, 7, 5, 9, 12, 11, 13]
test_tree = Tree(test_list)
x = test_tree.breadth_first()
for i in x:
assert i == [10, 7, 12, 5, 9, 11, 13]
