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import { assertEquals } from "https://deno.land/std@0.157.0/testing/asserts.ts";
import { TreeNode } from "../binary-tree-inorder-traversal/TreeNode.ts";import sumOfLeftLeaves from "./index.ts";
Deno.test("sum-of-left-leaves", () => {    assertEquals(0, sumOfLeftLeaves(null));    assertEquals(0, sumOfLeftLeaves(new TreeNode(1)));    assertEquals(        24,        sumOfLeftLeaves({            val: 3,            left: { val: 9, left: null, right: null },            right: {                val: 20,                left: { val: 15, left: null, right: null },                right: { val: 7, left: null, right: null },            },        }),    );});