var util = require('../lib/test-utils.js'); var expect = require('chai').expect; describe('fs.appendFile', function() { const contents = 'This is a file.'; beforeEach(function(done) { util.setup(function() { var fs = util.fs(); fs.writeFile('/myfile', contents, function(error) { if(error) throw error; done(); }); }); }); afterEach(util.cleanup); it('should be a function', function() { var fs = util.fs(); expect(fs.appendFile).to.be.a('function'); }); it('should append a utf8 file without specifying utf8 in appendFile', function(done) { var fs = util.fs(); var more = ' Appended.'; fs.appendFile('/myfile', more, function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents + more); done(); }); }); }); it('should append a utf8 file with "utf8" option to appendFile', function(done) { var fs = util.fs(); var more = ' Appended.'; fs.appendFile('/myfile', more, 'utf8', function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents + more); done(); }); }); }); it('should append a utf8 file with {encoding: "utf8"} option to appendFile', function(done) { var fs = util.fs(); var more = ' Appended.'; fs.appendFile('/myfile', more, { encoding: 'utf8' }, function(error) { if(error) throw error; fs.readFile('/myfile', { encoding: 'utf8' }, function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents + more); done(); }); }); }); it('should append a binary file', function(done) { var fs = util.fs(); // String and utf8 binary encoded versions of the same thing: 'This is a file.' var binary = Buffer.from([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]); var binary2 = Buffer.from([32, 65, 112, 112, 101, 110, 100, 101, 100, 46]); var binary3 = Buffer.from([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46, 32, 65, 112, 112, 101, 110, 100, 101, 100, 46]); fs.writeFile('/mybinaryfile', binary, function(error) { if(error) throw error; fs.appendFile('/mybinaryfile', binary2, function(error) { if(error) throw error; fs.readFile('/mybinaryfile', 'ascii', function(error, data) { expect(error).not.to.exist; expect(data).to.deep.equal(binary3); done(); }); }); }); }); it('should follow symbolic links', function(done) { var fs = util.fs(); var contents = 'This is a file.'; var more = ' Appended.'; fs.symlink('/myfile', '/myFileLink', function (error) { if (error) throw error; fs.appendFile('/myFileLink', more, 'utf8', function (error) { if (error) throw error; fs.readFile('/myFileLink', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents + more); done(); }); }); }); }); it('should work when file does not exist, and create the file', function(done) { var fs = util.fs(); fs.appendFile('/newfile', contents, { encoding: 'utf8' }, function(error) { expect(error).not.to.exist; fs.readFile('/newfile', 'utf8', function(err, data) { if(err) throw err; expect(data).to.equal(contents); done(); }); }); }); it('should accept numbers and append them to the file', function(done) { var fs = util.fs(); var more = 10000; fs.appendFile('/myfile', more, 'utf8', function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents + more); done(); }); }); }); }); describe('fs.promises.appendFile', function() { beforeEach(function(done) { util.setup(function() { var fs = util.fs(); return fs.promises.writeFile('/myfile', 'This is a file.', { encoding: 'utf8' }) .then(done) .catch(done); }); }); afterEach(util.cleanup); it('should be a function', function() { var fs = util.fs(); expect(fs.promises.appendFile).to.be.a('function'); }); it('should append a utf8 file without specifying utf8 in appendFile', function() { var fs = util.fs(); var contents = 'This is a file.'; var more = ' Appended.'; return fs.promises.appendFile('/myfile', more) .then(() => fs.promises.readFile('/myfile', 'utf8')) .then(data => expect(data).to.equal(contents + more)); }); it('should append a utf8 file with "utf8" option to appendFile', function() { var fs = util.fs(); var contents = 'This is a file.'; var more = ' Appended.'; return fs.promises.appendFile('/myfile', more, 'utf8') .then(() => fs.promises.readFile('/myfile', 'utf8')) .then(data => expect(data).to.equal(contents + more)); }); it('should append a utf8 file with {encoding: "utf8"} option to appendFile', function() { var fs = util.fs(); var contents = 'This is a file.'; var more = ' Appended.'; return fs.promises.appendFile('/myfile', more, { encoding: 'utf8' }) .then(() => fs.promises.readFile('/myfile', { encoding: 'utf8' })) .then(data => expect(data).to.equal(contents + more)); }); it('should append a binary file', function() { var fs = util.fs(); // String and utf8 binary encoded versions of the same thing: 'This is a file.' var binary = new Buffer([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]); var binary2 = new Buffer([32, 65, 112, 112, 101, 110, 100, 101, 100, 46]); var binary3 = new Buffer([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46, 32, 65, 112, 112, 101, 110, 100, 101, 100, 46]); return fs.promises.writeFile('/mybinaryfile', binary) .then(() => fs.promises.appendFile('/mybinaryfile', binary2)) .then(() => fs.promises.readFile('/mybinaryfile', 'ascii')) .then(data => expect(data).to.deep.equal(binary3)); }); it('should follow symbolic links', function() { var fs = util.fs(); var contents = 'This is a file.'; var more = ' Appended.'; return fs.promises.symlink('/myfile', '/myFileLink') .then(() => fs.promises.appendFile('/myFileLink', more, 'utf8')) .then(() => fs.promises.readFile('/myFileLink', 'utf8')) .then(data => expect(data).to.equal(contents + more)); }); it('should work when file does not exist, and create the file', function() { var fs = util.fs(); var contents = 'This is a file.'; return fs.promises.appendFile('/newfile', contents, { encoding: 'utf8' }) .then(() => fs.promises.readFile('/newfile', 'utf8')) .then(data => expect(data).to.equal(contents)); }); });