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std/bytes/copy_test.ts

Deno standard library
denoland/deno_std
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The Standard Library has been moved to JSR. See the blog post for details.
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.import { assert, assertEquals } from "../assert/mod.ts";import { copy } from "./copy.ts";
Deno.test("[bytes] copy", function () {  const dst = new Uint8Array(4);
  dst.fill(0);  let src = Uint8Array.of(1, 2);  let len = copy(src, dst, 0);  assert(len === 2);  assertEquals(dst, Uint8Array.of(1, 2, 0, 0));
  dst.fill(0);  src = Uint8Array.of(1, 2);  len = copy(src, dst, 1);  assert(len === 2);  assertEquals(dst, Uint8Array.of(0, 1, 2, 0));
  dst.fill(0);  src = Uint8Array.of(1, 2, 3, 4, 5);  len = copy(src, dst);  assert(len === 4);  assertEquals(dst, Uint8Array.of(1, 2, 3, 4));
  dst.fill(0);  src = Uint8Array.of(1, 2);  len = copy(src, dst, 100);  assert(len === 0);  assertEquals(dst, Uint8Array.of(0, 0, 0, 0));
  dst.fill(0);  src = Uint8Array.of(3, 4);  len = copy(src, dst, -2);  assert(len === 2);  assertEquals(dst, Uint8Array.of(3, 4, 0, 0));});