playwright/test/mocha/runner.js

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/**
* Copyright Microsoft Corporation. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const child_process = require('child_process');
const path = require('path');
const { EventEmitter } = require('events');
const Mocha = require('mocha');
const { Serializer } = require('v8');
const constants = Mocha.Runner.constants;
class Runner extends EventEmitter {
constructor(options) {
super();
this._maxWorkers = options.maxWorkers;
this._workers = new Set();
this._freeWorkers = [];
this._callbacks = [];
this._workerId = 0;
this.stats = {
duration: 0,
failures: 0,
passes: 0,
pending: 0,
tests: 0,
};
this._reporter = new options.reporter(this, {});
}
async run(files) {
this.emit(constants.EVENT_RUN_BEGIN, {});
const result = new Promise(f => this._runCallback = f);
for (const file of files) {
const worker = await this._obtainWorker();
worker.send({ method: 'run', params: file });
}
await result;
this.emit(constants.EVENT_RUN_END, {});
}
async _obtainWorker() {
if (this._freeWorkers.length)
return this._freeWorkers.pop();
if (this._workers.size < this._maxWorkers) {
const worker = child_process.fork(path.join(__dirname, 'worker.js'), {
detached: false
});
let readyCallback;
const result = new Promise(f => readyCallback = f);
worker.send({ method: 'init', params: ++this._workerId });
worker.on('message', message => {
if (message.method === 'ready')
readyCallback();
this._messageFromWorker(worker, message);
});
worker.on('exit', () => {
this._workers.delete(worker);
if (!this._workers.size)
this._runCallback();
});
this._workers.add(worker);
await result;
return worker;
}
return new Promise(f => this._callbacks.push(f));
}
_messageFromWorker(worker, message) {
const { method, params } = message;
switch (method) {
case 'done': {
if (this._callbacks.length) {
const callback = this._callbacks.shift();
callback(worker);
} else {
this._freeWorkers.push(worker);
if (this._freeWorkers.length === this._workers.size) {
this._runCallback();
}
}
break;
}
case 'start':
break;
case 'test':
this.emit(constants.EVENT_TEST_BEGIN, this._parse(params.test));
break;
case 'pending':
this.emit(constants.EVENT_TEST_PENDING, this._parse(params.test));
break;
case 'pass':
this.emit(constants.EVENT_TEST_PASS, this._parse(params.test));
break;
case 'fail':
const test = this._parse(params.test);
this.emit(constants.EVENT_TEST_FAIL, test, params.error);
break;
case 'end':
this.stats.duration += params.stats.duration;
this.stats.failures += params.stats.failures;
this.stats.passes += params.stats.passes;
this.stats.pending += params.stats.pending;
this.stats.tests += params.stats.tests;
break;
}
}
_parse(serialized) {
return {
...serialized,
currentRetry: () => serialized.currentRetry,
fullTitle: () => serialized.fullTitle,
slow: () => serialized.slow,
timeout: () => serialized.timeout,
titlePath: () => serialized.titlePath,
isPending: () => serialized.isPending,
parent: {
fullTitle: () => ''
}
};
}
async stop() {
const result = new Promise(f => this._stopCallback = f);
for (const worker of this._workers)
worker.send({ method: 'stop' });
await result;
}
}
module.exports = { Runner };