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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals, assertRejects } from "../testing/asserts.ts";import {  Buffer,  LimitedBytesTransformStream,  LimitedTransformStream,} 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]));});
Deno.test("[streams] LimitedBytesTransformStream", async function () {  const r = new ReadableStream({    start(controller) {      controller.enqueue(new Uint8Array([1, 2, 3]));      controller.enqueue(new Uint8Array([4, 5, 6]));      controller.enqueue(new Uint8Array([7, 8, 9]));      controller.enqueue(new Uint8Array([10, 11, 12]));      controller.enqueue(new Uint8Array([13, 14, 15]));      controller.enqueue(new Uint8Array([16, 17, 18]));      controller.close();    },  });
  const chunks = [];  for await (const chunk of r.pipeThrough(new LimitedBytesTransformStream(7))) {    chunks.push(chunk);  }  assertEquals(chunks.length, 2);});
Deno.test("[streams] LimitedBytesTransformStream error", async function () {  const r = new ReadableStream({    start(controller) {      controller.enqueue(new Uint8Array([1, 2, 3]));      controller.enqueue(new Uint8Array([4, 5, 6]));      controller.enqueue(new Uint8Array([7, 8, 9]));      controller.enqueue(new Uint8Array([10, 11, 12]));      controller.enqueue(new Uint8Array([13, 14, 15]));      controller.enqueue(new Uint8Array([16, 17, 18]));      controller.close();    },  });
  await assertRejects(async () => {    for await (      const _chunk of r.pipeThrough(        new LimitedBytesTransformStream(7, { error: true }),      )    ) {      // needed to read    }  }, RangeError);});
Deno.test("[streams] LimitedTransformStream", async function () {  const r = new ReadableStream({    start(controller) {      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.close();    },  });
  const chunks = [];  for await (const chunk of r.pipeThrough(new LimitedTransformStream(3))) {    chunks.push(chunk);  }  assertEquals(chunks.length, 3);});
Deno.test("[streams] LimitedTransformStream error", async function () {  const r = new ReadableStream({    start(controller) {      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.enqueue("foo");      controller.close();    },  });
  await assertRejects(async () => {    for await (      const _chunk of r.pipeThrough(        new LimitedTransformStream(3, { error: true }),      )    ) {      // needed to read    }  }, RangeError);});