def test_leafs():
node = Node("0")
node.extend(["1", "2"])
assert len(node.leafs) == 2
def test_lt(simple_node):
node = Node("1")
node.extend(["3", "4"])
assert node < simple_node
def test_contains(simple_node):
node = Node("1")
node.extend(["3", "4"])
assert node in simple_node
def test_eq(simple_node):
node = Node("1")
node.extend(["3", "4"])
assert node == simple_node["1"]
def simple_node():
node = Node("0")
node.extend(["1", "2"])
node["1"].extend(["3", "4"])
return node