node/test/parallel/test-fs-promises-readfile-with-fd.js
Livia Medeiros 74e0ca3f49
test: use tmpdir.resolve() in fs tests
PR-URL: https://github.com/nodejs/node/pull/49125
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
2023-08-15 13:45:14 +00:00

35 lines
977 B
JavaScript

'use strict';
// This test makes sure that `readFile()` always reads from the current
// position of the file, instead of reading from the beginning of the file.
const common = require('../common');
const assert = require('assert');
const { writeFileSync } = require('fs');
const { open } = require('fs').promises;
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const fn = tmpdir.resolve('test.txt');
writeFileSync(fn, 'Hello World');
async function readFileTest() {
const handle = await open(fn, 'r');
/* Read only five bytes, so that the position moves to five. */
const buf = Buffer.alloc(5);
const { bytesRead } = await handle.read(buf, 0, 5, null);
assert.strictEqual(bytesRead, 5);
assert.strictEqual(buf.toString(), 'Hello');
/* readFile() should read from position five, instead of zero. */
assert.strictEqual((await handle.readFile()).toString(), ' World');
await handle.close();
}
readFileTest()
.then(common.mustCall());