middleware-test.js
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/* eslint-env mocha */
var events = require('events');
var assert = require('assert');
var sinon = require('sinon');
var supertest = require('supertest');
var express = require('express');
var webpackHotMiddleware = require('../middleware');
describe("middleware", function() {
var s, compiler, app, middleware;
context("with default options", function() {
beforeEach(setupServer({log: function(){}}));
it("should create eventStream on /__webpack_hmr", function(done) {
request('/__webpack_hmr')
.expect('Content-Type', /^text\/event-stream\b/)
.end(done);
});
it("should heartbeat every 10 seconds", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
// Tick 3 times, then verify
var i = 0;
tick(10, 'seconds');
res.on('data', function() {
if (++i < 3) {
tick(10, 'seconds');
} else {
verify();
}
});
function verify() {
assert.equal(res.events.length, 3);
res.events.every(function(chunk) {
assert(/^data: /.test(chunk));
});
done();
}
});
});
it("should notify clients when bundle rebuild begins", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
compiler.emit("compile");
function verify() {
assert.equal(res.events.length, 1);
var event = JSON.parse(res.events[0].substring(5));
assert.equal(event.action, "building");
done();
}
});
});
it("should notify clients when bundle is complete", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
compiler.emit("done", stats({
time: 100,
hash: "deadbeeffeddad",
warnings: false,
errors: false,
modules: []
}));
function verify() {
assert.equal(res.events.length, 1);
var event = JSON.parse(res.events[0].substring(5));
assert.equal(event.action, "built");
done();
}
});
});
it("should notify clients when bundle is complete (multicompiler)", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
compiler.emit("done", stats({
children: [
{
time: 100,
hash: "deadbeeffeddad",
warnings: false,
errors: false,
modules: []
},
{
time: 150,
hash: "gwegawefawefawef",
warnings: false,
errors: false,
modules: []
}
]
}));
function verify() {
assert.equal(res.events.length, 1);
var event = JSON.parse(res.events[0].substring(5));
assert.equal(event.action, "built");
done();
}
});
});
it("should notify new clients about current compilation state", function(done) {
compiler.emit("done", stats({
time: 100,
hash: "deadbeeffeddad",
warnings: false,
errors: false,
modules: []
}));
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
assert.equal(res.events.length, 1);
var event = JSON.parse(res.events[0].substring(5));
assert.equal(event.action, "sync");
done();
});
});
it("should have tests on the payload of bundle complete");
it("should notify all clients", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
when();
});
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
when();
});
// Emit compile when both requests are connected
when.n = 0;
function when() {
if (++when.n < 2) return;
compiler.emit("compile");
}
// Finish test when both requests report data
verify.n = 0;
function verify() {
if (++verify.n < 2) return;
done();
}
});
it("should allow custom events to be published", function(done) {
request('/__webpack_hmr')
.end(function(err, res) {
if (err) return done(err);
res.on('data', verify);
middleware.publish({ obj: 'with stuff' });
function verify() {
assert.equal(res.events.length, 1);
var event = JSON.parse(res.events[0].substring(5));
assert.deepEqual(event, { obj: 'with stuff' });
done();
}
});
});
});
beforeEach(function() {
s = sinon.sandbox.create();
s.useFakeTimers();
compiler = new (events.EventEmitter)();
compiler.plugin = compiler.on;
});
afterEach(function() {
s.restore();
});
function tick(time, unit) {
if (unit == 'seconds') time *= 1000;
s.clock.tick(time + 10); // +10ms for some leeway
}
function setupServer(opts) {
return function() {
app = express();
middleware = webpackHotMiddleware(compiler, opts);
app.use(middleware);
};
}
function request(path) {
// Wrap some stuff up so supertest works with streaming responses
var req = supertest(app).get(path).buffer(false);
var end = req.end;
req.end = function(callback) {
req
.on('error', callback)
.on('response', function(res) {
Object.defineProperty(res, 'events', {get: function() {
return res.text.trim().split("\n\n");
}});
res.on('data', function(chunk) {
res.text = (res.text || '') + chunk;
});
process.nextTick(function() {
req.assert(null, res, function(err) {
callback(err, res);
});
});
});
end.call(req, function(){});
};
return req;
}
function stats(data) {
return {
toJson: function() {
return data;
}
};
}
});