stream
Version:
Node.js streams in the browser
174 lines (168 loc) • 5.8 kB
HTML
<html>
<head>
<script src="build/build.js"></script>
<script src="node_modules/mocha/mocha.js"></script>
<script src="node_modules/expect.js/expect.js"></script>
<link rel="stylesheet" href="node_modules/mocha/mocha.css" />
<script>
mocha.setup('bdd');
var $ = require('component-jquery');
var Emitter = require('component-emitter');
var Stream = require('stream');
describe('Stream', function() {
describe('module', function() {
it('should export a function', function() {
expect(Stream).to.be.a(Function);
});
it('should export Stream', function() {
expect(Stream.Stream).to.be.ok();
});
it('should be an EventEmitter', function() {
expect(Stream.prototype).to.be.an(Emitter);
});
});
describe('.pipe(dest)', function() {
var src, dest;
beforeEach(function() {
src = new Stream();
src.readable = true;
dest = new Stream();
dest.writable = true;
src.pipe(dest);
});
it('should pipe data', function(done) {
dest.write = function(data) {
expect(data).to.equal('like a boss');
done();
}
src.emit('data', 'like a boss');
});
it('shouldn\'t write to not writable streams', function() {
dest.writable = false;
src.emit('data', 'never received');
});
it('should pause', function(done) {
dest.write = function() { return false; }
src.emit('data', 'pause');
src.pause = done;
src.emit('data', 'pause');
});
it('should resume', function(done) {
dest.emit('drain');
src.readable = false;
dest.emit('drain');
src.readable = true;
src.resume = done;
dest.emit('drain');
});
it('should end', function(done) {
dest.end = done;
src.emit('end');
});
it('should end only once', function() {
var didOnEnd = false;
dest.end = function() {
if (didOnEnd) throw new Error('end called twice');
}
src.emit('end');
src.emit('end');
});
it('should close', function(done) {
dest.destroy = done;
src.emit('close');
});
it('should close without destroy function', function() {
src.emit('close');
});
it('should throw errors on uncaught exceptions in src', function(done) {
try {
src.emit('error', new Error('some error'));
} catch(err) {
expect(err).to.be.an(Error);
done();
}
});
it('should throw errors on uncaught exceptions in dest', function(done) {
try {
dest.emit('error', new Error('some error'));
} catch(err) {
expect(err).to.be.an(Error);
done();
}
});
it('shouldn\'t throw errors if listeners are present', function(done) {
src.on('error', function(err) {
expect(err).to.be.an(Error);
done();
});
src.emit('error', new Error('done'));
});
function empty(src, dest) {
expect(src.listeners('data')).to.be.empty();
expect(dest.listeners('drain')).to.be.empty();
expect(src.listeners('end')).to.be.empty();
expect(src.listeners('close')).to.be.empty();
expect(dest.listeners('end')).to.be.empty();
expect(dest.listeners('close')).to.be.empty();
}
it('should remove listeners on error in src', function() {
src.on('error', function(){});
src.emit('error', new Error('test'));
empty(src, dest);
});
it('should remove listeners on error in dest', function() {
dest.on('error', function(){})
dest.emit('error', new Error('test'));
empty(src, dest);
});
it('should remove listeners on end in src', function() {
dest.end = function(){}
src.emit('end');
empty(src, dest);
});
it('should remove listeners on close in src', function() {
dest.close = function(){}
src.emit('close');
empty(src, dest);
});
it('should remove listeners on end in dest', function() {
dest.end = function(){}
dest.emit('end');
empty(src, dest);
});
it('should remove listeners on close in dest', function() {
dest.close = function(){}
dest.emit('close');
empty(src, dest);
});
it('should emit pipe in dest', function(done) {
dest.on('pipe', function() {
done();
});
src.pipe(dest);
});
});
describe('.pipe(dest, options)', function() {
it('shouldn\'t end if specified', function() {
var src = new Stream();
src.readable = true;
var dest = new Stream();
dest.writable = true;
dest.end = function() {
throw Error('shouldn\'t be called');
}
src.pipe(dest, {end: false});
src.emit('end');
});
});
});
$(function() {
mocha.run();
});
</script>
</head>
<body>
<div id="mocha"></div>
</body>
</html>