def METHOD_NAME(self):
    records = [
        Record(0, 0),
        Record(1, 0),
        Record(2, 0),
        Record(3, 0)
    ]
    root = BuildTree(records)
    self.assert_node_is_branch(root, node_id=0, children_count=3)
    self.assert_node_is_leaf(root.children[0], node_id=1)
    self.assert_node_is_leaf(root.children[1], node_id=2)
    self.assert_node_is_leaf(root.children[2], node_id=3)