var util = require('../lib/test-utils.js'); var expect = require('chai').expect; describe('fs.read', function() { beforeEach(util.setup); afterEach(util.cleanup); it('should be a function', function() { var fs = util.fs(); expect(fs.read).to.be.a('function'); }); it('should read data from a file', function(done) { var fs = util.fs(); var wbuffer = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]); var rbuffer = Buffer.alloc(wbuffer.length); fs.open('/myfile', 'w+', function(error, fd) { if(error) throw error; fs.write(fd, wbuffer, 0, wbuffer.length, 0, function(error, result) { if(error) throw error; expect(result).to.equal(wbuffer.length); fs.read(fd, rbuffer, 0, rbuffer.length, 0, function(error, result) { expect(error).not.to.exist; expect(result).to.equal(rbuffer.length); expect(wbuffer).to.deep.equal(rbuffer); done(); }); }); }); }); it('should update the current file position', function(done) { var fs = util.fs(); var wbuffer = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]); var rbuffer = Buffer.alloc(wbuffer.length); var _result = 0; fs.open('/myfile', 'w+', function(error, fd) { if(error) throw error; fs.write(fd, wbuffer, 0, wbuffer.length, 0, function(error, result) { if(error) throw error; expect(result).to.equal(wbuffer.length); fs.read(fd, rbuffer, 0, rbuffer.length / 2, undefined, function(error, result) { if(error) throw error; _result += result; fs.read(fd, rbuffer, rbuffer.length / 2, rbuffer.length, undefined, function(error, result) { if(error) throw error; _result += result; expect(error).not.to.exist; expect(_result).to.equal(rbuffer.length); expect(wbuffer).to.deep.equal(rbuffer); done(); }); }); }); }); }); it('should fail to read a directory', function(done) { var fs = util.fs(); var buf = Buffer.alloc(20); var buf2 = Buffer.alloc(20); fs.mkdir('/mydir', function(error) { if(error) throw error; fs.open('/mydir', 'r', function(error, fd) { if(error) throw error; fs.read(fd, buf, 0, buf.length, 0, function(error, result) { expect(error).to.exist; expect(error.code).to.equal('EISDIR'); expect(result).to.equal(0); expect(buf).to.deep.equal(buf2); done(); }); }); }); }); it('should fail to read a file that does not exist', function(done) { var fs = util.fs(); var fd = 0; var rbuffer = Buffer.alloc(8); fs.read(fd, rbuffer, 0, rbuffer.length, 0, function(error, result) { expect(error).to.exist; expect(result).not.to.exist; expect(error.code).to.equal('EBADF'); done(); }); }); });