test: increase coverage for fs.promises.truncate · nodejs/node@94dcdfb

'use strict';

const common = require('../common');

const assert = require('assert');

const path = require('path');

const { open, readFile } = require('fs').promises;

const tmpdir = require('../common/tmpdir');

tmpdir.refresh();

common.crashOnUnhandledRejection();

async function validateTruncate() {

const text = 'Hello world';

const filename = path.resolve(tmpdir.path, 'truncate-file.txt');

const fileHandle = await open(filename, 'w+');

const buffer = Buffer.from(text, 'utf8');

await fileHandle.write(buffer, 0, buffer.length);

assert.deepStrictEqual((await readFile(filename)).toString(), text);

await fileHandle.truncate(5);

assert.deepStrictEqual((await readFile(filename)).toString(), 'Hello');

}

validateTruncate().then(common.mustCall());

mkdir,

mkdtemp,

open,

readFile,

readdir,

readlink,

realpath,

rename,

rmdir,

stat,

symlink,

truncate,

unlink,

utimes

} = fsPromises;

const ret2 = await handle.read(Buffer.alloc(buf2Len), 0, buf2Len, 0);

assert.strictEqual(ret2.bytesRead, buf2Len);

assert.deepStrictEqual(ret2.buffer, buf2);

await truncate(dest, 5);

assert.deepStrictEqual((await readFile(dest)).toString(), 'hello');

await chmod(dest, 0o666);

await handle.chmod(0o666);