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// Copyright Node.js contributors. All rights reserved. MIT License.import finished from "./end_of_stream.ts";import Readable from "./readable.ts";import Transform from "./transform.ts";import Writable from "./writable.ts";import { mustCall } from "../_utils.ts";import { assert, fail } from "../../testing/asserts.ts";import { deferred, delay } from "../../async/mod.ts";
Deno.test("Finished appends to Readable correctly", async () => {  const rs = new Readable({    read() {},  });
  const [finishedExecution, finishedCb] = mustCall((err) => {    assert(!err);  });
  finished(rs, finishedCb);
  rs.push(null);  rs.resume();
  await finishedExecution;});
Deno.test("Finished appends to Writable correctly", async () => {  const ws = new Writable({    write(_data, _enc, cb) {      cb();    },  });
  const [finishedExecution, finishedCb] = mustCall((err) => {    assert(!err);  });
  finished(ws, finishedCb);
  ws.end();
  await finishedExecution;});
Deno.test("Finished appends to Transform correctly", async () => {  const tr = new Transform({    transform(_data, _enc, cb) {      cb();    },  });
  let finish = false;  let ended = false;
  tr.on("end", () => {    ended = true;  });
  tr.on("finish", () => {    finish = true;  });
  const [finishedExecution, finishedCb] = mustCall((err) => {    assert(!err);    assert(finish);    assert(ended);  });
  finished(tr, finishedCb);
  tr.end();  tr.resume();
  await finishedExecution;});
Deno.test("The function returned by Finished clears the listeners", async () => {  const finishedExecution = deferred();
  const ws = new Writable({    write(_data, _env, cb) {      cb();    },  });
  const removeListener = finished(ws, () => {    finishedExecution.reject();  });  removeListener();  ws.end();
  await Promise.race([    delay(100),    finishedExecution,  ])    .catch(() => fail("Finished was executed"));});