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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { copyN } from "./copy_n.ts";import { Buffer } from "./buffer.ts";import { StringReader } from "./string_reader.ts";
Deno.test("testCopyN1", async function () {  const w = new Buffer();  const r = new StringReader("abcdefghij");  const n = await copyN(r, w, 3);  assertEquals(n, 3);  assertEquals(new TextDecoder().decode(w.bytes()), "abc");});
Deno.test("testCopyN2", async function () {  const w = new Buffer();  const r = new StringReader("abcdefghij");  const n = await copyN(r, w, 11);  assertEquals(n, 10);  assertEquals(new TextDecoder().decode(w.bytes()), "abcdefghij");});
Deno.test("copyNWriteAllData", async function () {  const tmpDir = await Deno.makeTempDir();  const filepath = `${tmpDir}/data`;  const file = await Deno.open(filepath, { create: true, write: true });
  const size = 16 * 1024 + 1;  const data = "a".repeat(32 * 1024);  const r = new StringReader(data);  const n = await copyN(r, file, size); // Over max file possible buffer  file.close();  await Deno.remove(filepath);
  assertEquals(n, size);});