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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This code has been ported almost directly from Go's src/bytes/buffer_test.go// Copyright 2009 The Go Authors. All rights reserved. BSD license.// https://github.com/golang/go/blob/master/LICENSEimport { assertEquals } from "../assert/mod.ts";import { BufWriter, BufWriterSync } from "./buf_writer.ts";import { Buffer } from "./buffer.ts";import { StringWriter } from "./string_writer.ts";import { bufsizes } from "./_test_common.ts";import type { Writer, WriterSync } from "./types.ts";
Deno.test("BufWriter.write() writes different number of bytes", async function () {  const data = new Uint8Array(8192);
  for (let i = 0; i < data.byteLength; i++) {    data[i] = " ".charCodeAt(0) + (i % ("~".charCodeAt(0) - " ".charCodeAt(0)));  }
  const w = new Buffer();  for (const nwrite of bufsizes) {    for (const bs of bufsizes) {      // Write nwrite bytes using buffer size bs.      // Check that the right amount makes it out      // and that the data is correct.
      w.reset();      const buf = new BufWriter(w, bs);
      const context = `nwrite=${nwrite} bufsize=${bs}`;      const n = await buf.write(data.subarray(0, nwrite));      assertEquals(n, nwrite, context);
      await buf.flush();
      const written = w.bytes();      assertEquals(written.byteLength, nwrite);
      for (let l = 0; l < written.byteLength; l++) {        assertEquals(written[l], data[l]);      }    }  }});
Deno.test("BufWriter.writeSync()", function () {  const data = new Uint8Array(8192);
  for (let i = 0; i < data.byteLength; i++) {    data[i] = " ".charCodeAt(0) + (i % ("~".charCodeAt(0) - " ".charCodeAt(0)));  }
  const w = new Buffer();  for (const nwrite of bufsizes) {    for (const bs of bufsizes) {      // Write nwrite bytes using buffer size bs.      // Check that the right amount makes it out      // and that the data is correct.
      w.reset();      const buf = new BufWriterSync(w, bs);
      const context = `nwrite=${nwrite} bufsize=${bs}`;      const n = buf.writeSync(data.subarray(0, nwrite));      assertEquals(n, nwrite, context);
      buf.flush();
      const written = w.bytes();      assertEquals(written.byteLength, nwrite);
      for (let l = 0; l < written.byteLength; l++) {        assertEquals(written[l], data[l]);      }    }  }});
Deno.test({  name: "Reset buffer after flush",  async fn() {    const stringWriter = new StringWriter();    const bufWriter = new BufWriter(stringWriter);    const encoder = new TextEncoder();    await bufWriter.write(encoder.encode("hello\nworld\nhow\nare\nyou?\n\n"));    await bufWriter.flush();    await bufWriter.write(encoder.encode("foobar\n\n"));    await bufWriter.flush();    const actual = stringWriter.toString();    assertEquals(actual, "hello\nworld\nhow\nare\nyou?\n\nfoobar\n\n");  },});
Deno.test({  name: "Reset buffer after flush sync",  fn() {    const stringWriter = new StringWriter();    const bufWriter = new BufWriterSync(stringWriter);    const encoder = new TextEncoder();    bufWriter.writeSync(encoder.encode("hello\nworld\nhow\nare\nyou?\n\n"));    bufWriter.flush();    bufWriter.writeSync(encoder.encode("foobar\n\n"));    bufWriter.flush();    const actual = stringWriter.toString();    assertEquals(actual, "hello\nworld\nhow\nare\nyou?\n\nfoobar\n\n");  },});
Deno.test({  name: "BufWriter.flush should write all bytes",  async fn() {    const bufSize = 16 * 1024;    const data = new Uint8Array(bufSize);    data.fill("a".charCodeAt(0));
    const cache: Uint8Array[] = [];    const writer: Writer = {      write(p: Uint8Array): Promise<number> {        cache.push(p.subarray(0, 1));
        // Writer that only writes 1 byte at a time        return Promise.resolve(1);      },    };
    const bufWriter = new BufWriter(writer);    await bufWriter.write(data);
    await bufWriter.flush();    const buf = new Uint8Array(cache.length);    for (const [i, val] of cache.entries()) buf.set(val, i);
    assertEquals(data, buf);  },});
Deno.test({  name: "BufWriterSync.flush should write all bytes",  fn() {    const bufSize = 16 * 1024;    const data = new Uint8Array(bufSize);    data.fill("a".charCodeAt(0));
    const cache: Uint8Array[] = [];    const writer: WriterSync = {      writeSync(p: Uint8Array): number {        cache.push(p.subarray(0, 1));        // Writer that only writes 1 byte at a time        return 1;      },    };
    const bufWriter = new BufWriterSync(writer);    bufWriter.writeSync(data);
    bufWriter.flush();    const buf = new Uint8Array(cache.length);    for (const [i, val] of cache.entries()) buf.set(val, i);
    assertEquals(data, buf);  },});