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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { assertEquals, assertNotEquals, fail } from "../../testing/asserts.ts";import { assertCallbackErrorUncaught } from "../_test_utils.ts";import { readdir, readdirSync } from "./_fs_readdir.ts";import { join } from "../../path/mod.ts";
Deno.test({  name: "ASYNC: reading empty directory",  async fn() {    const dir = Deno.makeTempDirSync();    await new Promise<string[]>((resolve, reject) => {      readdir(dir, (err, files) => {        if (err) reject(err);        resolve(files);      });    })      .then((files) => assertEquals(files, []), () => fail())      .finally(() => Deno.removeSync(dir));  },});
function assertEqualsArrayAnyOrder<T>(actual: T[], expected: T[]) {  assertEquals(actual.length, expected.length);  for (const item of expected) {    const index = actual.indexOf(item);    assertNotEquals(index, -1);    expected = expected.splice(index, 1);  }}
Deno.test({  name: "ASYNC: reading non-empty directory",  async fn() {    const dir = Deno.makeTempDirSync();    Deno.writeTextFileSync(join(dir, "file1.txt"), "hi");    Deno.writeTextFileSync(join(dir, "file2.txt"), "hi");    Deno.mkdirSync(join(dir, "some_dir"));    await new Promise<string[]>((resolve, reject) => {      readdir(dir, (err, files) => {        if (err) reject(err);        resolve(files);      });    })      .then(        (files) =>          assertEqualsArrayAnyOrder(            files,            ["file1.txt", "some_dir", "file2.txt"],          ),        () => fail(),      )      .finally(() => Deno.removeSync(dir, { recursive: true }));  },});
Deno.test({  name: "SYNC: reading empty the directory",  fn() {    const dir = Deno.makeTempDirSync();    assertEquals(readdirSync(dir), []);  },});
Deno.test({  name: "SYNC: reading non-empty directory",  fn() {    const dir = Deno.makeTempDirSync();    Deno.writeTextFileSync(join(dir, "file1.txt"), "hi");    Deno.writeTextFileSync(join(dir, "file2.txt"), "hi");    Deno.mkdirSync(join(dir, "some_dir"));    assertEqualsArrayAnyOrder(      readdirSync(dir),      ["file1.txt", "some_dir", "file2.txt"],    );  },});
Deno.test("[std/node/fs] readdir callback isn't called twice if error is thrown", async () => {  // The correct behaviour is not to catch any errors thrown,  // but that means there'll be an uncaught error and the test will fail.  // So the only way to test this is to spawn a subprocess, and succeed if it has a non-zero exit code.  // (assertRejects won't work because there's no way to catch the error.)  const tempDir = await Deno.makeTempDir();  const importUrl = new URL("./_fs_readdir.ts", import.meta.url);  await assertCallbackErrorUncaught({    prelude: `import { readdir } from ${JSON.stringify(importUrl)}`,    invocation: `readdir(${JSON.stringify(tempDir)}, `,    async cleanup() {      await Deno.remove(tempDir);    },  });});