filer/tests/spec/fs.truncate.spec.js

190 lines
4.9 KiB
JavaScript

var util = require('../lib/test-utils.js');
var expect = require('chai').expect;
describe('fs.truncate', function() {
beforeEach(util.setup);
afterEach(util.cleanup);
it('should be a function', function() {
var fs = util.fs();
expect(fs.truncate).to.be.a('function');
});
it('should error when length is negative', function(done) {
var fs = util.fs();
var contents = 'This is a file.';
fs.writeFile('/myfile', contents, function(error) {
if(error) throw error;
fs.truncate('/myfile', -1, function(error) {
expect(error).to.exist;
expect(error.code).to.equal('EINVAL');
done();
});
});
});
it('should error when path is not a file', function(done) {
var fs = util.fs();
fs.truncate('/', 0, function(error) {
expect(error).to.exist;
expect(error.code).to.equal('EISDIR');
done();
});
});
it('should truncate a file', function(done) {
var fs = util.fs();
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Buffer([1]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
var fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
fs.close(fd, function(error) {
if(error) throw error;
fs.truncate('/myfile', 1, function(error) {
expect(error).not.to.exist;
fs.readFile('/myfile', function(error, result) {
if(error) throw error;
expect(result).to.deep.equal(truncated);
done();
});
});
});
});
});
});
it('should pad a file with zeros when the length is greater than the file size', function(done) {
var fs = util.fs();
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Buffer([1, 2, 3, 4, 5, 6, 7, 8, 0]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
var fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
fs.close(fd, function(error) {
if(error) throw error;
fs.truncate('/myfile', 9, function(error) {
expect(error).not.to.exist;
fs.readFile('/myfile', function(error, result) {
if(error) throw error;
expect(result).to.deep.equal(truncated);
done();
});
});
});
});
});
});
it('should update the file size', function(done) {
var fs = util.fs();
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
var fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
fs.close(fd, function(error) {
if(error) throw error;
fs.truncate('/myfile', 0, function(error) {
expect(error).not.to.exist;
fs.stat('/myfile', function(error, result) {
if(error) throw error;
expect(result.size).to.equal(0);
done();
});
});
});
});
});
});
it('should truncate a valid descriptor', function(done) {
var fs = util.fs();
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
var fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
fs.ftruncate(fd, 0, function(error) {
expect(error).not.to.exist;
fs.fstat(fd, function(error, result) {
if(error) throw error;
expect(result.size).to.equal(0);
done();
});
});
});
});
});
it('should follow symbolic links', function(done) {
var fs = util.fs();
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
var fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
fs.close(fd, function(error) {
if(error) throw error;
fs.symlink('/myfile', '/mylink', function(error) {
if(error) throw error;
fs.truncate('/mylink', 0, function(error) {
expect(error).not.to.exist;
fs.stat('/myfile', function(error, result) {
if(error) throw error;
expect(result.size).to.equal(0);
fs.lstat('/mylink', function(error, result) {
if(error) throw error;
expect(result.size).not.to.equal(0);
done();
});
});
});
});
});
});
});
});
});