1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23const common = require('../common'); 24const tmpdir = require('../common/tmpdir'); 25 26// This test ensures that `fs.truncate` opens the file with `r+` and not `w`, 27// which had earlier resulted in the target file's content getting zeroed out. 28// https://github.com/nodejs/node-v0.x-archive/issues/6233 29 30const assert = require('assert'); 31const fs = require('fs'); 32 33const filename = `${tmpdir.path}/truncate-file.txt`; 34 35tmpdir.refresh(); 36 37// Synchronous test. 38{ 39 fs.writeFileSync(filename, '0123456789'); 40 assert.strictEqual(fs.readFileSync(filename).toString(), '0123456789'); 41 fs.truncateSync(filename, 5); 42 assert.strictEqual(fs.readFileSync(filename).toString(), '01234'); 43} 44 45// Asynchronous test. 46{ 47 fs.writeFileSync(filename, '0123456789'); 48 assert.strictEqual(fs.readFileSync(filename).toString(), '0123456789'); 49 fs.truncate( 50 filename, 51 5, 52 common.mustSucceed(() => { 53 assert.strictEqual(fs.readFileSync(filename).toString(), '01234'); 54 }) 55 ); 56} 57