filer/tests/spec/fs.ftruncate.spec.js

214 lines
5.6 KiB
JavaScript

const util = require('../lib/test-utils.js');
const expect = require('chai').expect;
describe('fs.ftruncate', function() {
beforeEach(util.setup);
afterEach(util.cleanup);
it('should be a function', function() {
let fs = util.fs();
expect(fs.ftruncate).to.be.a('function');
});
it('should return an error if length is not an integer', function(done) {
let fs = util.fs();
let contents = 'This is a file.';
fs.writeFile('/myfile', contents, function(error) {
if(error) throw error;
fs.open('/myfile', 'w', function(err, fd) {
fs.ftruncate(fd, 'notAnInteger', function(error) {
expect(error).to.exist;
expect(error.code).to.equal('EINVAL');
done();
});
// Close file descriptor when done
fs.close(fd);
});
});
});
it('should return an error if length is negative', function(done) {
let fs = util.fs();
let contents = 'This is a file.';
fs.writeFile('/myfile', contents, function(error) {
if(error) throw error;
fs.open('/myfile', 'w', function(err, fd) {
fs.ftruncate(fd, -1, function(error) {
expect(error).to.exist;
expect(error.code).to.equal('EINVAL');
done();
});
// Close file descriptor when done
fs.close(fd);
});
});
});
it('should return an error if file descriptor is negative', function(done) {
let fs = util.fs();
// File descriptor should be a non-negative number
fs.ftruncate(-1, 0, function(error) {
expect(error).to.exist;
expect(error.code).to.equal('EBADF');
done();
});
});
it('should truncate a file', function(done) {
let fs = util.fs();
let buffer = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
let truncated = Buffer.from([1, 2]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
let fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
expect(result).to.equal(buffer.length);
// Truncate file to first two bytes
fs.ftruncate(fd, 2, function(error) {
expect(error).not.to.exist;
});
fs.close(fd, function(error) {
if(error) throw error;
fs.readFile('/myfile', function(error, result) {
if(error) throw error;
expect(result).to.deep.equal(truncated);
done();
});
});
});
});
});
it('should truncate a valid descriptor', function(done) {
var fs = util.fs();
var buffer = Buffer.from([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;
expect(result).to.equal(buffer.length);
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 pad a file with zeros when the length is greater than the file size', function(done) {
let fs = util.fs();
let buffer = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
let truncated = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8, 0]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
let fd = result;
fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
if(error) throw error;
expect(result).to.equal(buffer.length);
fs.ftruncate(fd, 9, function(error) {
expect(error).not.to.exist;
});
fs.close(fd, function(error) {
if(error) throw error;
fs.readFile('/myfile', function(error, result) {
if(error) throw error;
expect(result).to.deep.equal(truncated);
done();
});
});
});
});
});
it('should assume a length of 0 if passed undefined', function(done) {
var fs = util.fs();
var buffer = Buffer.from([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;
expect(result).to.equal(buffer.length);
// Pass undefined to see that it defaults to 0
fs.ftruncate(fd, undefined, function(error) {
expect(error).not.to.exist;
fs.stat('/myfile', function(error, result) {
if(error) throw error;
expect(result.size).to.equal(0);
done();
});
});
// Close file descriptor
fs.close(fd);
});
});
});
it('should update the file size', function(done) {
var fs = util.fs();
var buffer = Buffer.from([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;
expect(result).to.equal(buffer.length);
fs.ftruncate(fd, 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();
});
});
// Close file descriptor
fs.close(fd);
});
});
});
});