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Copy pathstack-streams.js
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177 lines (138 loc) · 3.47 KB
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'use strict';
var Runtime = require('../');
var through = require('through2');
var EndStream = through.ctor(
function write (chunk, enc, callback) {
this.push(chunk);
callback();
},
function end (callback) {
callback(); this.emit('end');
}
);
it('uses the callback when a stream throws an error', function (done) {
var runtime = Runtime.create();
function one () {
var stream = through();
setTimeout(function () {
stream.write({});
}, Math.random()*10);
return stream;
}
runtime.stack(one)(function (err) {
err.should.be.instanceof(Error);
done();
});
});
it('uses the callback when a stream emits an error', function (done) {
var error = Error('on no!');
var runtime = Runtime.create();
function one () {
var stream = new EndStream();
setTimeout(function () {
stream.emit('error', error);
}, Math.random()*10);
return stream;
}
runtime.stack(one)(function (err) {
err.should.be.eql(error);
done();
});
});
it('passes error to onHandleError if no callback was given', function (done) {
var error = new Error('not again...');
var runtime = Runtime.createClass({
onHandleError: function (err) {
if (!(err instanceof Error)) {
return done(new Error('was\'t an instance of error'));
}
err.should.be.eql(error);
done();
}
}).create();
function one () {
var stream = new EndStream();
setTimeout(function () {
stream.emit('error', error);
}, Math.random()*10);
return stream;
}
runtime.stack(one)();
});
it('runs the callback after completion of all streams', function (done) {
var runtime = Runtime.create();
var count = 0;
function one () {
var stream = new EndStream().once('end', function () {
++count;
});
setTimeout(function () {
stream.end('one');
}, Math.random()*10);
return stream;
}
function two () {
var stream = new EndStream().once('end', function () {
++count;
});
setTimeout(function () {
stream.end('two');
}, Math.random()*10);
return stream;
}
runtime.stack(one, two)(function (err) {
if (err) { return done(err); }
count.should.be.eql(2);
done();
});
});
it('runs in parallel by default', function (done) {
var runtime = Runtime.create();
var stack = '';
function one () {
var stream = new EndStream().once('end', function () {
stack += 'one';
});
setTimeout(function () {
stream.end();
}, Math.random()*10);
return stream;
}
function two () {
var stream = new EndStream().once('end', function () {
stack += 'two';
});
setTimeout(stream.end.bind(stream));
return stream;
}
runtime.stack(one, two, one, two)(function (err) {
if (err) { return done(err); }
stack.should.not.be.eql('onetwoonetwo');
done();
});
});
it('runs in series with {wait: true}', function (done) {
var runtime = Runtime.create();
var stack = '';
function one () {
var stream = new EndStream().once('end', function () {
stack += 'one';
});
setTimeout(function () {
stream.end();
}, Math.random()*10);
return stream;
}
function two () {
var stream = new EndStream().once('end', function () {
stack += 'two';
});
setTimeout(stream.end.bind(stream));
return stream;
}
runtime.stack(one, two, {wait: true})(function (err) {
if (err) { return done(err); }
stack.should.be.eql('onetwo');
done();
});
});