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import { TreeNode } from "../binary-tree-inorder-traversal/TreeNode.ts";import { assertEquals } from "../deps.ts";import levelOrder from "./index.ts";
Deno.test("binary-tree-level-order-traversal", () => {    const root = new TreeNode(3);    root.left = new TreeNode(9);    root.right = new TreeNode(20);    root.right.left = new TreeNode(15);    root.right.right = new TreeNode(7);    const result = levelOrder(root);    assertEquals(result, [[3], [9, 20], [15, 7]]);
    assertEquals([[1]], levelOrder(new TreeNode(1)));    assertEquals([], levelOrder(null));});