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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals } from "../testing/asserts.ts";import { Buffer } from "./buffer.ts";
Deno.test("[streams] Buffer Write & Read", async function () {  const buf = new Buffer();  const writer = buf.writable.getWriter();  const reader = buf.readable.getReader({ mode: "byob" });  const data = new Uint8Array([4, 21, 45, 19]);  await writer.write(data);  const read = await reader.read(new Uint8Array(4));  assertEquals(read.value, data);});
Deno.test("[streams] Buffer Read empty", async function () {  const buf = new Buffer();  const reader = buf.readable.getReader({ mode: "byob" });  const read = await reader.read(new Uint8Array(5));  assert(read.done);  assertEquals(read.value!.byteLength, 0);});
Deno.test("[streams] Buffer Write & get bytes", async function () {  const buf = new Buffer();  const writer = buf.writable.getWriter();  const data = new Uint8Array([4, 21, 45, 19]);  await writer.write(data);  assertEquals(buf.bytes(), data);});
Deno.test("[streams] Buffer truncate", async function () {  const buf = new Buffer();  const writer = buf.writable.getWriter();  await writer.write(new Uint8Array([4, 21, 45, 19]));  buf.truncate(3);  assertEquals(buf.bytes(), new Uint8Array([4, 21, 45]));});