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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { assertEquals } from "../testing/asserts.ts";import { LimitedReader, MultiReader, StringReader } from "./readers.ts";import { StringWriter } from "./writers.ts";import { copyN } from "./util.ts";import { copy } from "../streams/copy.ts";import { readAll } from "../streams/read_all.ts";
Deno.test("ioStringReader", async function () {  const r = new StringReader("abcdef");  const res0 = await r.read(new Uint8Array(6));  assertEquals(res0, 6);  const res1 = await r.read(new Uint8Array(6));  assertEquals(res1, null);});
Deno.test("ioStringReader", async function () {  const decoder = new TextDecoder();  const r = new StringReader("abcdef");  const buf = new Uint8Array(3);  const res1 = await r.read(buf);  assertEquals(res1, 3);  assertEquals(decoder.decode(buf), "abc");  const res2 = await r.read(buf);  assertEquals(res2, 3);  assertEquals(decoder.decode(buf), "def");  const res3 = await r.read(buf);  assertEquals(res3, null);  assertEquals(decoder.decode(buf), "def");});
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");});
Deno.test("ioLimitedReader", async function () {  const decoder = new TextDecoder();  let sr = new StringReader("abc");  let r = new LimitedReader(sr, 2);  let buffer = await readAll(r);  assertEquals(decoder.decode(buffer), "ab");  assertEquals(decoder.decode(await readAll(sr)), "c");  sr = new StringReader("abc");  r = new LimitedReader(sr, 3);  buffer = await readAll(r);  assertEquals(decoder.decode(buffer), "abc");  assertEquals((await readAll(r)).length, 0);  sr = new StringReader("abc");  r = new LimitedReader(sr, 4);  buffer = await readAll(r);  assertEquals(decoder.decode(buffer), "abc");  assertEquals((await readAll(r)).length, 0);});
Deno.test("ioLimitedReader", async function () {  const rb = new StringReader("abc");  const wb = new StringWriter();  await copy(new LimitedReader(rb, -1), wb);  assertEquals(wb.toString(), "");});