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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../assert/mod.ts";import { toWritableStream } from "./to_writable_stream.ts";import type { Closer, Writer } from "./types.ts";
class MockWriterCloser implements Writer, Closer {  chunks: Uint8Array[] = [];  closeCall = 0;
  write(p: Uint8Array): Promise<number> {    if (this.closeCall) {      throw new Error("already closed");    }    if (p.length) {      this.chunks.push(p);    }    return Promise.resolve(p.length);  }
  close() {    this.closeCall++;  }}
Deno.test("toWritableStream()", async function () {  const written: string[] = [];  const chunks: string[] = ["hello", "deno", "land"];  const decoder = new TextDecoder();
  async function write(p: Uint8Array): Promise<number> {    written.push(decoder.decode(p));    return await Promise.resolve(p.length);  }
  const writableStream = toWritableStream({ write });
  const encoder = new TextEncoder();  const streamWriter = writableStream.getWriter();  for (const chunk of chunks) {    await streamWriter.write(encoder.encode(chunk));  }
  assertEquals(written, chunks);});
Deno.test("toWritableStream() calls close on close", async function () {  const written: string[] = [];  const chunks: string[] = ["hello", "deno", "land"];  const decoder = new TextDecoder();
  const writer = new MockWriterCloser();  const writableStream = toWritableStream(writer);
  const encoder = new TextEncoder();  const streamWriter = writableStream.getWriter();  for (const chunk of chunks) {    await streamWriter.write(encoder.encode(chunk));  }  await streamWriter.close();
  for (const chunk of writer.chunks) {    written.push(decoder.decode(chunk));  }
  assertEquals(written, chunks);  assertEquals(writer.closeCall, 1);});
Deno.test("toWritableStream() calls close on abort", async function () {  const written: string[] = [];  const chunks: string[] = ["hello", "deno", "land"];  const decoder = new TextDecoder();
  const writer = new MockWriterCloser();  const writableStream = toWritableStream(writer);
  const encoder = new TextEncoder();  const streamWriter = writableStream.getWriter();  for (const chunk of chunks) {    await streamWriter.write(encoder.encode(chunk));  }  await streamWriter.abort();
  for (const chunk of writer.chunks) {    written.push(decoder.decode(chunk));  }
  assertEquals(written, chunks);  assertEquals(writer.closeCall, 1);});
Deno.test("toWritableStream() doesn't call close with autoClose false", async function () {  const written: string[] = [];  const chunks: string[] = ["hello", "deno", "land"];  const decoder = new TextDecoder();
  const writer = new MockWriterCloser();  const writableStream = toWritableStream(writer, { autoClose: false });
  const encoder = new TextEncoder();  const streamWriter = writableStream.getWriter();  for (const chunk of chunks) {    await streamWriter.write(encoder.encode(chunk));  }  await streamWriter.close();
  for (const chunk of writer.chunks) {    written.push(decoder.decode(chunk));  }
  assertEquals(written, chunks);  assertEquals(writer.closeCall, 0);});