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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { MultiReader } from "./multi_reader.ts";import { StringWriter } from "./string_writer.ts";import { copyN } from "./copy_n.ts";import { copy } from "../streams/copy.ts";import { StringReader } from "./string_reader.ts";
Deno.test("ioMultiReader", async function () {  const r = new MultiReader([new StringReader("abc"), new StringReader("def")]);  const w = new StringWriter();  const n = await copyN(r, w, 4);  assertEquals(n, 4);  assertEquals(w.toString(), "abcd");  await copy(r, w);  assertEquals(w.toString(), "abcdef");});