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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { assertCallbackErrorUncaught } from "../_test_utils.ts";import { readFile, readFileSync } from "./_fs_readFile.ts";import * as path from "../../path/mod.ts";import { assert, assertEquals } from "../../testing/asserts.ts";
const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));const testData = path.resolve(moduleDir, "testdata", "hello.txt");
Deno.test("readFileSuccess", async function () {  const data = await new Promise((res, rej) => {    readFile(testData, (err, data) => {      if (err) {        rej(err);      }      res(data);    });  });
  assert(data instanceof Uint8Array);  assertEquals(new TextDecoder().decode(data as Uint8Array), "hello world");});
Deno.test("readFileEncodeUtf8Success", async function () {  const data = await new Promise((res, rej) => {    readFile(testData, { encoding: "utf8" }, (err, data) => {      if (err) {        rej(err);      }      res(data);    });  });  assertEquals(typeof data, "string");  assertEquals(data as string, "hello world");});
Deno.test("readFileEncodeHexSuccess", async function () {  const data = await new Promise((res, rej) => {    readFile(testData, { encoding: "hex" }, (err, data) => {      if (err) {        rej(err);      }      res(data);    });  });
  assertEquals(typeof data, "string");  assertEquals(data as string, "68656c6c6f20776f726c64");});
Deno.test("readFileEncodeBase64Success", async function () {  const data = await new Promise((res, rej) => {    readFile(testData, { encoding: "base64" }, (err, data) => {      if (err) {        rej(err);      }      res(data);    });  });  assertEquals(typeof data, "string");  assertEquals(data as string, "aGVsbG8gd29ybGQ=");});
Deno.test("readFileEncodingAsString", async function () {  const data = await new Promise((res, rej) => {    readFile(testData, "utf8", (err, data) => {      if (err) {        rej(err);      }      res(data);    });  });
  assertEquals(typeof data, "string");  assertEquals(data as string, "hello world");});
Deno.test("readFileSyncSuccess", function () {  const data = readFileSync(testData);  assert(data instanceof Uint8Array);  assertEquals(new TextDecoder().decode(data as Uint8Array), "hello world");});
Deno.test("readFileEncodeUtf8Success", function () {  const data = readFileSync(testData, { encoding: "utf8" });  assertEquals(typeof data, "string");  assertEquals(data as string, "hello world");});
Deno.test("readFileEncodeHexSuccess", function () {  const data = readFileSync(testData, { encoding: "hex" });  assertEquals(typeof data, "string");  assertEquals(data as string, "68656c6c6f20776f726c64");});
Deno.test("readFileEncodeBase64Success", function () {  const data = readFileSync(testData, { encoding: "base64" });  assertEquals(typeof data, "string");  assertEquals(data as string, "aGVsbG8gd29ybGQ=");});
Deno.test("readFileEncodeAsString", function () {  const data = readFileSync(testData, "utf8");  assertEquals(typeof data, "string");  assertEquals(data as string, "hello world");});
Deno.test("[std/node/fs] readFile callback isn't called twice if error is thrown", async () => {  const tempFile = await Deno.makeTempFile();  const importUrl = new URL("./_fs_readFile.ts", import.meta.url);  await assertCallbackErrorUncaught({    prelude: `import { readFile } from ${JSON.stringify(importUrl)}`,    invocation: `readFile(${JSON.stringify(tempFile)}, `,    async cleanup() {      await Deno.remove(tempFile);    },  });});