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

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