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const { copy, test } = Deno;import { assertEquals } from "../testing/asserts.ts";import { MultiReader, StringReader } from "./readers.ts";import { StringWriter } from "./writers.ts";import { copyN } from "./ioutil.ts";import { decode } from "../encoding/utf8.ts";
test(async function ioStringReader(): Promise<void> {  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, Deno.EOF);});
test(async function ioStringReader(): Promise<void> {  const r = new StringReader("abcdef");  const buf = new Uint8Array(3);  const res1 = await r.read(buf);  assertEquals(res1, 3);  assertEquals(decode(buf), "abc");  const res2 = await r.read(buf);  assertEquals(res2, 3);  assertEquals(decode(buf), "def");  const res3 = await r.read(buf);  assertEquals(res3, Deno.EOF);  assertEquals(decode(buf), "def");});
test(async function ioMultiReader(): Promise<void> {  const r = new MultiReader(new StringReader("abc"), new StringReader("def"));  const w = new StringWriter();  const n = await copyN(w, r, 4);  assertEquals(n, 4);  assertEquals(w.toString(), "abcd");  await copy(w, r);  assertEquals(w.toString(), "abcdef");});