puppeteer/test/worker.spec.js

/**
 * Copyright 2020 Google Inc. 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 expect = require('expect');
const {
  getTestState,
  setupTestBrowserHooks,
  setupTestPageAndContextHooks,
} = require('./mocha-utils');
const utils = require('./utils');
const { waitEvent } = utils;

describeFailsFirefox('Workers', function () {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();
  it('Page.workers', async () => {
    const { page, server } = getTestState();

    await Promise.all([
      new Promise((x) => page.once('workercreated', x)),
      page.goto(server.PREFIX + '/worker/worker.html'),
    ]);
    const worker = page.workers()[0];
    expect(worker.url()).toContain('worker.js');

    expect(await worker.evaluate(() => self.workerFunction())).toBe(
      'worker function result'
    );

    await page.goto(server.EMPTY_PAGE);
    expect(page.workers().length).toBe(0);
  });
  it('should emit created and destroyed events', async () => {
    const { page } = getTestState();

    const workerCreatedPromise = new Promise((x) =>
      page.once('workercreated', x)
    );
    const workerObj = await page.evaluateHandle(
      () => new Worker('data:text/javascript,1')
    );
    const worker = await workerCreatedPromise;
    const workerThisObj = await worker.evaluateHandle(() => this);
    const workerDestroyedPromise = new Promise((x) =>
      page.once('workerdestroyed', x)
    );
    await page.evaluate((workerObj) => workerObj.terminate(), workerObj);
    expect(await workerDestroyedPromise).toBe(worker);
    const error = await workerThisObj
      .getProperty('self')
      .catch((error) => error);
    expect(error.message).toContain('Most likely the worker has been closed.');
  });
  it('should report console logs', async () => {
    const { page } = getTestState();

    const [message] = await Promise.all([
      waitEvent(page, 'console'),
      page.evaluate(() => new Worker(`data:text/javascript,console.log(1)`)),
    ]);
    expect(message.text()).toBe('1');
    expect(message.location()).toEqual({
      url: 'data:text/javascript,console.log(1)',
      lineNumber: 0,
      columnNumber: 8,
    });
  });
  it('should have JSHandles for console logs', async () => {
    const { page } = getTestState();

    const logPromise = new Promise((x) => page.on('console', x));
    await page.evaluate(
      () => new Worker(`data:text/javascript,console.log(1,2,3,this)`)
    );
    const log = await logPromise;
    expect(log.text()).toBe('1 2 3 JSHandle@object');
    expect(log.args().length).toBe(4);
    expect(await (await log.args()[3].getProperty('origin')).jsonValue()).toBe(
      'null'
    );
  });
  it('should have an execution context', async () => {
    const { page } = getTestState();

    const workerCreatedPromise = new Promise((x) =>
      page.once('workercreated', x)
    );
    await page.evaluate(
      () => new Worker(`data:text/javascript,console.log(1)`)
    );
    const worker = await workerCreatedPromise;
    expect(await (await worker.executionContext()).evaluate('1+1')).toBe(2);
  });
  it('should report errors', async () => {
    const { page } = getTestState();

    const errorPromise = new Promise((x) => page.on('pageerror', x));
    await page.evaluate(
      () =>
        new Worker(`data:text/javascript, throw new Error('this is my error');`)
    );
    const errorLog = await errorPromise;
    expect(errorLog.message).toContain('this is my error');
  });
});