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denoland-deno/tests/node_compat/test/parallel/test-fs-readfile-fd.js

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// deno-fmt-ignore-file
// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 20.11.1
// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.
'use strict';
const common = require('../common');
// Test fs.readFile using a file descriptor.
const fixtures = require('../common/fixtures');
const assert = require('assert');
const fs = require('fs');
const fn = fixtures.path('empty.txt');
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
tempFd(function(fd, close) {
fs.readFile(fd, function(err, data) {
assert.ok(data);
close();
});
});
tempFd(function(fd, close) {
fs.readFile(fd, 'utf8', function(err, data) {
assert.strictEqual(data, '');
close();
});
});
tempFdSync(function(fd) {
assert.ok(fs.readFileSync(fd));
});
tempFdSync(function(fd) {
assert.strictEqual(fs.readFileSync(fd, 'utf8'), '');
});
function tempFd(callback) {
fs.open(fn, 'r', function(err, fd) {
assert.ifError(err);
callback(fd, function() {
fs.close(fd, function(err) {
assert.ifError(err);
});
});
});
}
function tempFdSync(callback) {
const fd = fs.openSync(fn, 'r');
callback(fd);
fs.closeSync(fd);
}
{
// This test makes sure that `readFile()` always reads from the current
// position of the file, instead of reading from the beginning of the file,
// when used with file descriptors.
const filename = tmpdir.resolve('test.txt');
fs.writeFileSync(filename, 'Hello World');
{
// Tests the fs.readFileSync().
const fd = fs.openSync(filename, 'r');
// Read only five bytes, so that the position moves to five.
const buf = Buffer.alloc(5);
assert.strictEqual(fs.readSync(fd, buf, 0, 5), 5);
assert.strictEqual(buf.toString(), 'Hello');
// readFileSync() should read from position five, instead of zero.
assert.strictEqual(fs.readFileSync(fd).toString(), ' World');
fs.closeSync(fd);
}
{
// Tests the fs.readFile().
fs.open(filename, 'r', common.mustSucceed((fd) => {
const buf = Buffer.alloc(5);
// Read only five bytes, so that the position moves to five.
fs.read(fd, buf, 0, 5, null, common.mustSucceed((bytes) => {
assert.strictEqual(bytes, 5);
assert.strictEqual(buf.toString(), 'Hello');
fs.readFile(fd, common.mustSucceed((data) => {
// readFile() should read from position five, instead of zero.
assert.strictEqual(data.toString(), ' World');
fs.closeSync(fd);
}));
}));
}));
}
}