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// Copyright Node.js contributors. All rights reserved. MIT License.import { Buffer } from "../buffer.ts";import finished from "./end_of_stream.ts";import Writable from "../_stream/writable.ts";import { deferred } from "../../async/mod.ts";import {  assert,  assertEquals,  assertStrictEquals,  assertThrows,} from "../../testing/asserts.ts";
Deno.test("Writable stream writes correctly", async () => {  let callback: undefined | ((error?: Error | null | undefined) => void);
  let writeExecuted = 0;  const writeExecutedExpected = 1;  const writeExpectedExecutions = deferred();
  let writevExecuted = 0;  const writevExecutedExpected = 1;  const writevExpectedExecutions = deferred();
  const writable = new Writable({    write: (chunk, encoding, cb) => {      writeExecuted++;      if (writeExecuted == writeExecutedExpected) {        writeExpectedExecutions.resolve();      }      assert(chunk instanceof Buffer);      assertStrictEquals(encoding, "buffer");      assertStrictEquals(String(chunk), "ABC");      callback = cb;    },    writev: (chunks) => {      writevExecuted++;      if (writevExecuted == writevExecutedExpected) {        writevExpectedExecutions.resolve();      }      assertStrictEquals(chunks.length, 2);      assertStrictEquals(chunks[0].encoding, "buffer");      assertStrictEquals(chunks[1].encoding, "buffer");      assertStrictEquals(chunks[0].chunk + chunks[1].chunk, "DEFGHI");    },  });
  writable.write(new TextEncoder().encode("ABC"));  writable.write(new TextEncoder().encode("DEF"));  writable.end(new TextEncoder().encode("GHI"));  callback?.();
  const writeTimeout = setTimeout(    () => writeExpectedExecutions.reject(),    1000,  );  const writevTimeout = setTimeout(    () => writevExpectedExecutions.reject(),    1000,  );  await writeExpectedExecutions;  await writevExpectedExecutions;  clearTimeout(writeTimeout);  clearTimeout(writevTimeout);  assertEquals(writeExecuted, writeExecutedExpected);  assertEquals(writevExecuted, writevExecutedExpected);});
Deno.test("Writable stream writes Uint8Array in object mode", async () => {  let writeExecuted = 0;  const writeExecutedExpected = 1;  const writeExpectedExecutions = deferred();
  const ABC = new TextEncoder().encode("ABC");
  const writable = new Writable({    objectMode: true,    write: (chunk, encoding, cb) => {      writeExecuted++;      if (writeExecuted == writeExecutedExpected) {        writeExpectedExecutions.resolve();      }      assert(!(chunk instanceof Buffer));      assert(chunk instanceof Uint8Array);      assertEquals(chunk, ABC);      assertEquals(encoding, "utf8");      cb();    },  });
  writable.end(ABC);
  const writeTimeout = setTimeout(    () => writeExpectedExecutions.reject(),    1000,  );  await writeExpectedExecutions;  clearTimeout(writeTimeout);  assertEquals(writeExecuted, writeExecutedExpected);});
Deno.test("Writable stream throws on unexpected close", async () => {  let finishedExecuted = 0;  const finishedExecutedExpected = 1;  const finishedExpectedExecutions = deferred();
  const writable = new Writable({    write: () => {},  });  writable.writable = false;  writable.destroy();
  finished(writable, (err) => {    finishedExecuted++;    if (finishedExecuted == finishedExecutedExpected) {      finishedExpectedExecutions.resolve();    }    assertEquals(err?.code, "ERR_STREAM_PREMATURE_CLOSE");  });
  const finishedTimeout = setTimeout(    () => finishedExpectedExecutions.reject(),    1000,  );  await finishedExpectedExecutions;  clearTimeout(finishedTimeout);  assertEquals(finishedExecuted, finishedExecutedExpected);});
Deno.test("Writable stream finishes correctly", async () => {  let finishedExecuted = 0;  const finishedExecutedExpected = 1;  const finishedExpectedExecutions = deferred();
  const w = new Writable({    write(_chunk, _encoding, cb) {      cb();    },    autoDestroy: false,  });
  w.end("asd");
  queueMicrotask(() => {    finished(w, () => {      finishedExecuted++;      if (finishedExecuted == finishedExecutedExpected) {        finishedExpectedExecutions.resolve();      }    });  });
  const finishedTimeout = setTimeout(    () => finishedExpectedExecutions.reject(),    1000,  );  await finishedExpectedExecutions;  clearTimeout(finishedTimeout);  assertEquals(finishedExecuted, finishedExecutedExpected);});
Deno.test("Writable stream finishes correctly after error", async () => {  let errorExecuted = 0;  const errorExecutedExpected = 1;  const errorExpectedExecutions = deferred();
  let finishedExecuted = 0;  const finishedExecutedExpected = 1;  const finishedExpectedExecutions = deferred();
  const w = new Writable({    write(_chunk, _encoding, cb) {      cb(new Error());    },    autoDestroy: false,  });  w.write("asd");  w.on("error", () => {    errorExecuted++;    if (errorExecuted == errorExecutedExpected) {      errorExpectedExecutions.resolve();    }    finished(w, () => {      finishedExecuted++;      if (finishedExecuted == finishedExecutedExpected) {        finishedExpectedExecutions.resolve();      }    });  });
  const errorTimeout = setTimeout(    () => errorExpectedExecutions.reject(),    1000,  );  const finishedTimeout = setTimeout(    () => finishedExpectedExecutions.reject(),    1000,  );  await finishedExpectedExecutions;  await errorExpectedExecutions;  clearTimeout(finishedTimeout);  clearTimeout(errorTimeout);  assertEquals(finishedExecuted, finishedExecutedExpected);  assertEquals(errorExecuted, errorExecutedExpected);});
Deno.test("Writable stream fails on 'write' null value", () => {  const writable = new Writable();  assertThrows(() => writable.write(null));});