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import Vector2D from "./index.ts";import { assertEquals } from "https://deno.land/std@0.155.0/testing/asserts.ts";Deno.test("flatten-2d-vector", () => {    const iterator = new Vector2D([[1, 2], [3], [4]]);
    assertEquals(1, iterator.next()); // 返回 1    assertEquals(2, iterator.next()); // 返回 2    assertEquals(3, iterator.next()); // 返回 3    assertEquals(true, iterator.hasNext()); // 返回 true    assertEquals(true, iterator.hasNext()); // 返回 true    assertEquals(4, iterator.next()); // 返回 4    assertEquals(false, iterator.hasNext()); // 返回 false});Deno.test("flatten-2d-vector", () => {    const iterator = new Vector2D([[1, 2], [3], [4, 5, 6]]);
    const res: number[] = [];    while (iterator.hasNext()) {        res.push(iterator.next() as number);    }    assertEquals([1, 2, 3, 4, 5, 6], res);});