filer/tests/spec/fs.lseek.spec.js

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var Filer = require('../..');
var util = require('../lib/test-utils.js');
var expect = require('chai').expect;
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describe('fs.lseek', function() {
beforeEach(util.setup);
afterEach(util.cleanup);
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it('should be a function', function() {
var fs = util.fs();
expect(fs.lseek).to.be.a('function');
});
it('should not follow symbolic links', function(done) {
var fs = util.fs();
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fs.open('/myfile', 'w', function (error, fd) {
if (error) throw error;
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fs.close(fd, function (error) {
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if (error) throw error;
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fs.symlink('/myfile', '/myFileLink', function (error) {
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if (error) throw error;
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fs.rename('/myFileLink', '/myOtherFileLink', function (error) {
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if (error) throw error;
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fs.stat('/myfile', function (error, result) {
expect(error).not.to.exist;
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fs.lstat('/myFileLink', function (error, result) {
expect(error).to.exist;
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fs.stat('/myOtherFileLink', function (error, result) {
if (error) throw error;
expect(result.nlinks).to.equal(1);
done();
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});
});
});
});
});
});
});
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});
it('should set the current position if whence is SET', function(done) {
var fs = util.fs();
var offset = 3;
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var result_buffer = new Uint8Array(buffer.length + offset);
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fs.open('/myfile', 'w+', function(error, fd) {
if(error) throw error;
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fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
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if(error) throw error;
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fs.lseek(fd, offset, 'SET', function(error, result) {
expect(error).not.to.exist;
expect(result).to.equal(offset);
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fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
if(error) throw error;
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fs.read(fd, result_buffer, 0, result_buffer.length, 0, function(error, result) {
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if(error) throw error;
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fs.stat('/myfile', function(error, result) {
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if(error) throw error;
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expect(result.size).to.equal(offset + buffer.length);
var expected = new Uint8Array([1, 2, 3, 1, 2, 3, 4, 5, 6, 7, 8]);
expect(result_buffer).to.deep.equal(expected);
done();
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});
});
});
});
});
});
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});
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it('should update the current position if whence is CUR', function(done) {
var fs = util.fs();
var offset = -2;
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var result_buffer = new Uint8Array(2 * buffer.length + offset);
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fs.open('/myfile', 'w+', function(error, fd) {
if(error) throw error;
fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
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if(error) throw error;
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fs.lseek(fd, offset, 'CUR', function(error, result) {
expect(error).not.to.exist;
expect(result).to.equal(offset + buffer.length);
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fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
if(error) throw error;
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fs.read(fd, result_buffer, 0, result_buffer.length, 0, function(error, result) {
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if(error) throw error;
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fs.stat('/myfile', function(error, result) {
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if(error) throw error;
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expect(result.size).to.equal(offset + 2 * buffer.length);
var expected = new Uint8Array([1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8]);
expect(result_buffer).to.deep.equal(expected);
done();
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});
});
});
});
});
});
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});
it('should update the current position if whence is END', function(done) {
var fs = util.fs();
var offset = 5;
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var result_buffer;
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fs.open('/myfile', 'w+', function(error, result) {
if(error) throw error;
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var fd1 = result;
fs.write(fd1, buffer, 0, buffer.length, undefined, function(error, result) {
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if(error) throw error;
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fs.open('/myfile', 'w+', function(error, result) {
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if(error) throw error;
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var fd2 = result;
fs.lseek(fd2, offset, 'END', function(error, result) {
expect(error).not.to.exist;
expect(result).to.equal(offset + buffer.length);
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fs.write(fd2, buffer, 0, buffer.length, undefined, function(error, result) {
if(error) throw error;
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fs.stat('/myfile', function(error, result) {
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if(error) throw error;
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expect(result.size).to.equal(offset + 2 * buffer.length);
result_buffer = new Uint8Array(result.size);
fs.read(fd2, result_buffer, 0, result_buffer.length, 0, function(error, result) {
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if(error) throw error;
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var expected = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8]);
expect(result_buffer).to.deep.equal(expected);
done();
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});
});
});
});
});
});
});
});
});