filer/tests/spec/fs.writeFile-readFile.spec.js

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