var util = require('../lib/test-utils.js'); var expect = require('chai').expect; describe('fs.writeFile, fs.readFile', function() { beforeEach(util.setup); afterEach(util.cleanup); it('should be a function', function() { var fs = util.fs(); expect(fs.writeFile).to.be.a('function'); expect(fs.readFile).to.be.a('function'); }); it('should error when path is wrong to readFile', function(done) { var fs = util.fs(); fs.readFile('/no-such-file', 'utf8', function(error, data) { expect(error).to.exist; expect(error.code).to.equal('ENOENT'); expect(data).not.to.exist; done(); }); }); it('should error when path is wrong to writeFile',function(done){ var fs = util.fs(); fs.writeFile('/tmp/myfile', '','utf8', function(error, result) { expect(error).to.exist; expect(error.code).to.equal('ENOENT'); expect(result).not.to.exist; done(); }); }); it('should write, read a utf8 file without specifying utf8 in writeFile', function(done) { var fs = util.fs(); var contents = 'This is a file.'; fs.writeFile('/myfile', contents, function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents); done(); }); }); }); it('should write, read a utf8 file with "utf8" option to writeFile', function(done) { var fs = util.fs(); var contents = 'This is a file.'; fs.writeFile('/myfile', contents, 'utf8', function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents); done(); }); }); }); it('should write, read a utf8 file with {encoding: "utf8"} option to writeFile', function(done) { var fs = util.fs(); var contents = 'This is a file.'; fs.writeFile('/myfile', contents, { encoding: 'utf8' }, function(error) { if(error) throw error; fs.readFile('/myfile', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents); done(); }); }); }); it('should write, read 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]); fs.writeFile('/myfile', binary, function(error) { if(error) throw error; fs.readFile('/myfile', function(error, data) { expect(error).not.to.exist; expect(data).to.deep.equal(binary); done(); }); }); }); it('should follow symbolic links', function(done) { var fs = util.fs(); var contents = 'This is a file.'; fs.writeFile('/myfile', '', { encoding: 'utf8' }, function(error) { if(error) throw error; fs.symlink('/myfile', '/myFileLink', function (error) { if (error) throw error; fs.writeFile('/myFileLink', contents, 'utf8', function (error) { if (error) throw error; fs.readFile('/myFileLink', 'utf8', function(error, data) { expect(error).not.to.exist; expect(data).to.equal(contents); done(); }); }); }); }); }); }); /** * fsPromises tests */ describe('fsPromises.writeFile, fsPromises.readFile', function() { beforeEach(util.setup); afterEach(util.cleanup); it('should be a function', function() { var fsPromises = util.fs().promises; expect(fsPromises.writeFile).to.be.a('function'); expect(fsPromises.readFile).to.be.a('function'); }); it('should return a promise', function() { var fsPromises = util.fs().promises; var contents = 'This is a file.'; var p = fsPromises.writeFile('/myfile', contents); expect(p).to.be.a('Promise'); p.then(() => { expect(fsPromises.readFile('/myfile', 'utf8')).to.be.a('Promise'); }); return p; }); it('should error when path is wrong to readFile', function() { var fsPromises = util.fs().promises; return fsPromises.readFile('/no-such-file', 'utf8') .catch(error => { expect(error).to.exist; expect(error.code).to.equal('ENOENT'); }); }); it('should write, read a utf8 file without specifying utf8 in writeFile', function() { var fsPromises = util.fs().promises; var contents = 'This is a file.'; return fsPromises.writeFile('/myfile', contents) .then( () => fsPromises.readFile('/myfile', 'utf8')) .then(data => { expect(data).to.equal(contents); }); }); it('should write, read a utf8 file with "utf8" option to writeFile', function() { var fsPromises = util.fs().promises; var contents = 'This is a file.'; return fsPromises.writeFile('/myfile', contents, 'utf8') .then( () => fsPromises.readFile('/myfile', 'utf8')) .then(data => { expect(data).to.equal(contents); }); }); it('should write, read a utf8 file with {encoding: "utf8"} option to writeFile', function() { var fsPromises = util.fs().promises; var contents = 'This is a file.'; return fsPromises.writeFile('/myfile', contents, { encoding: 'utf8' }) .then( () => fsPromises.readFile('/myfile', 'utf8')) .then(data => { expect(data).to.equal(contents); }); }); it('should write, read a binary file', function() { var fsPromises = util.fs().promises; // 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]); return fsPromises.writeFile('/myfile', binary) .then( () => fsPromises.readFile('/myfile')) .then(data => { expect(data).to.deep.equal(binary); }); }); it('should follow symbolic links', function() { var fsPromises = util.fs().promises; var contents = 'This is a file.'; return fsPromises.writeFile('/myfile', '', { encoding: 'utf8' }) .then( () => fsPromises.symlink('/myfile', '/myFileLink')) .then( () => fsPromises.writeFile('/myFileLink', contents, 'utf8')) .then( () => fsPromises.readFile('/myFileLink', 'utf8')) .then(data => { expect(data).to.equal(contents); }); }); });