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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.import { assertEquals } from "../testing/asserts.ts";import { StringWriter } from "./writers.ts";import { StringReader } from "./readers.ts";import { copyN } from "./ioutil.ts";
Deno.test("ioStringWriter", async function (): Promise<void> {  const w = new StringWriter("base");  const r = new StringReader("0123456789");  await copyN(r, w, 4);  assertEquals(w.toString(), "base0123");  await Deno.copy(r, w);  assertEquals(w.toString(), "base0123456789");});
Deno.test("ioStringWriterSync", function (): void {  const encoder = new TextEncoder();  const w = new StringWriter("");  w.writeSync(encoder.encode("deno"));  assertEquals(w.toString(), "deno");  w.writeSync(encoder.encode("\nland"));  assertEquals(w.toString(), "deno\nland");});