playwright/tests/page/page-evaluate-no-stall.spec.ts

/**
 * Copyright (c) Microsoft Corporation.
 *
 * 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.
 */

import { test, expect } from './pageTest';

test('should work', async ({ page, server, toImpl }) => {
  await page.goto(server.EMPTY_PAGE);
  const result = await toImpl(page.mainFrame()).nonStallingRawEvaluateInExistingMainContext('2+2');
  expect(result).toBe(4);
});

test('should throw while pending navigation', async ({ page, server, toImpl }) => {
  await page.goto(server.EMPTY_PAGE);
  await page.evaluate(() => document.body.textContent = 'HELLO WORLD');
  let error;
  await page.route('**/empty.html', async (route, request) => {
    error = await toImpl(page.mainFrame()).nonStallingRawEvaluateInExistingMainContext('2+2').catch(e => e);
    route.abort();
  });
  await page.goto(server.EMPTY_PAGE).catch(() => {});
  expect(error.message).toContain('Frame is currently attempting a navigation');
});

test('should throw when no main execution context', async ({ page, toImpl }) => {
  let errorPromise;
  page.on('frameattached', frame => {
    errorPromise = toImpl(frame).nonStallingRawEvaluateInExistingMainContext('2+2').catch(e => e);
  });
  await page.setContent('<iframe></iframe>');
  const error = await errorPromise;
  // bail out if we accidentally succeeded
  if (error === 4)
    return;
  // Testing this as a race.
  expect([
    'Frame does not yet have a main execution context',
    'Frame is currently attempting a navigation',
    'Navigation interrupted the evaluation',
  ]).toContain(error.message);
});