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var should = require('should');
var through = require('through2');
var OrderedStreams = require('../');
describe('ordered-read-streams', function () {
it('should end if no streams are given', function (done) {
var streams = OrderedStreams();
streams.on('data', function () {
done('error');
});
streams.on('end', done);
});
it('should throw error if one or more streams are not readable', function (done) {
var writable = { readable: false };
try {
new OrderedStreams(writable);
} catch (e) {
e.message.should.equal('All input streams must be readable');
done();
}
});
it('should emit data from all streams', function(done) {
var s1 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var s2 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var s3 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var streams = new OrderedStreams([s1, s2, s3]);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
results[0].should.equal('stream 1');
results[1].should.equal('stream 2');
results[2].should.equal('stream 3');
done();
});
s1.write('stream 1');
s1.end();
s2.write('stream 2');
s2.end();
s3.write('stream 3');
s3.end();
});
it('should emit all data event from each stream', function (done) {
var s = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var streams = new OrderedStreams(s);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
done();
});
s.write('data1');
s.write('data2');
s.write('data3');
s.end();
});
it('should preserve streams order', function(done) {
var s1 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 200);
});
var s2 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 30);
});
var s3 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 100);
});
var streams = new OrderedStreams([s1, s2, s3]);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
results[0].should.equal('stream 1');
results[1].should.equal('stream 2');
results[2].should.equal('stream 3');
done();
});
s1.write('stream 1');
s1.end();
s2.write('stream 2');
s2.end();
s3.write('stream 3');
s3.end();
});
it('should emit stream errors downstream', function (done) {
var s = through.obj(function (data, enc, next) {
this.emit('error', new Error('stahp!'));
next();
});
var s2 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var errMsg;
var streamData;
var streams = new OrderedStreams([s, s2]);
streams.on('data', function (data) {
streamData = data;
});
streams.on('error', function (err) {
errMsg = err.message;
});
streams.on('end', function () {
errMsg.should.equal('stahp!');
streamData.should.equal('Im ok!');
done();
});
s.write('go');
s.end();
s2.write('Im ok!');
s2.end();
});
});
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