puppeteer/test/waittask.spec.ts

/**
 * Copyright 2018 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.
 */

import utils from './utils.js';
import sinon from 'sinon';
import expect from 'expect';
import {
  getTestState,
  setupTestBrowserHooks,
  setupTestPageAndContextHooks,
  itFailsFirefox,
} from './mocha-utils'; // eslint-disable-line import/extensions

describe('waittask specs', function () {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();

  describe('Page.waitFor', function () {
    /* This method is deprecated but we don't want the warnings showing up in
     * tests. Until we remove this method we still want to ensure we don't break
     * it.
     */
    beforeEach(() => sinon.stub(console, 'warn').callsFake(() => {}));

    it('should wait for selector', async () => {
      const { page, server } = getTestState();

      let found = false;
      const waitFor = page.waitFor('div').then(() => (found = true));
      await page.goto(server.EMPTY_PAGE);
      expect(found).toBe(false);
      await page.goto(server.PREFIX + '/grid.html');
      await waitFor;
      expect(found).toBe(true);
    });

    it('should wait for an xpath', async () => {
      const { page, server } = getTestState();

      let found = false;
      const waitFor = page.waitFor('//div').then(() => (found = true));
      await page.goto(server.EMPTY_PAGE);
      expect(found).toBe(false);
      await page.goto(server.PREFIX + '/grid.html');
      await waitFor;
      expect(found).toBe(true);
    });
    it('should not allow you to select an element with single slash xpath', async () => {
      const { page } = getTestState();

      await page.setContent(`<div>some text</div>`);
      let error = null;
      await page.waitFor('/html/body/div').catch((error_) => (error = error_));
      expect(error).toBeTruthy();
    });
    it('should timeout', async () => {
      const { page } = getTestState();

      const startTime = Date.now();
      const timeout = 42;
      await page.waitFor(timeout);
      expect(Date.now() - startTime).not.toBeLessThan(timeout / 2);
    });
    it('should work with multiline body', async () => {
      const { page } = getTestState();

      const result = await page.waitForFunction(`
        (() => true)()
      `);
      expect(await result.jsonValue()).toBe(true);
    });
    it('should wait for predicate', async () => {
      const { page } = getTestState();

      await Promise.all([
        page.waitFor(() => window.innerWidth < 100),
        page.setViewport({ width: 10, height: 10 }),
      ]);
    });
    it('should throw when unknown type', async () => {
      const { page } = getTestState();

      let error = null;
      // @ts-expect-error purposefully passing bad type for test
      await page.waitFor({ foo: 'bar' }).catch((error_) => (error = error_));
      expect(error.message).toContain('Unsupported target type');
    });
    it('should wait for predicate with arguments', async () => {
      const { page } = getTestState();

      await page.waitFor((arg1, arg2) => arg1 !== arg2, {}, 1, 2);
    });

    it('should log a deprecation warning', async () => {
      const { page } = getTestState();

      await page.waitFor(() => true);

      const consoleWarnStub = console.warn as sinon.SinonSpy;

      expect(consoleWarnStub.calledOnce).toBe(true);
      expect(
        consoleWarnStub.firstCall.calledWith(
          'waitFor is deprecated and will be removed in a future release. See https://github.com/puppeteer/puppeteer/issues/6214 for details and how to migrate your code.'
        )
      ).toBe(true);
      expect((console.warn as sinon.SinonSpy).calledOnce).toBe(true);
    });
  });

  describe('Frame.waitForFunction', function () {
    it('should accept a string', async () => {
      const { page } = getTestState();

      const watchdog = page.waitForFunction('window.__FOO === 1');
      await page.evaluate(() => (globalThis.__FOO = 1));
      await watchdog;
    });
    it('should work when resolved right before execution context disposal', async () => {
      const { page } = getTestState();

      await page.evaluateOnNewDocument(() => (globalThis.__RELOADED = true));
      await page.waitForFunction(() => {
        if (!globalThis.__RELOADED) window.location.reload();
        return true;
      });
    });
    it('should poll on interval', async () => {
      const { page } = getTestState();

      let success = false;
      const startTime = Date.now();
      const polling = 100;
      const watchdog = page
        .waitForFunction(() => globalThis.__FOO === 'hit', { polling })
        .then(() => (success = true));
      await page.evaluate(() => (globalThis.__FOO = 'hit'));
      expect(success).toBe(false);
      await page.evaluate(() =>
        document.body.appendChild(document.createElement('div'))
      );
      await watchdog;
      expect(Date.now() - startTime).not.toBeLessThan(polling / 2);
    });
    it('should poll on interval async', async () => {
      const { page } = getTestState();
      let success = false;
      const startTime = Date.now();
      const polling = 100;
      const watchdog = page
        .waitForFunction(async () => globalThis.__FOO === 'hit', { polling })
        .then(() => (success = true));
      await page.evaluate(async () => (globalThis.__FOO = 'hit'));
      expect(success).toBe(false);
      await page.evaluate(async () =>
        document.body.appendChild(document.createElement('div'))
      );
      await watchdog;
      expect(Date.now() - startTime).not.toBeLessThan(polling / 2);
    });
    it('should poll on mutation', async () => {
      const { page } = getTestState();

      let success = false;
      const watchdog = page
        .waitForFunction(() => globalThis.__FOO === 'hit', {
          polling: 'mutation',
        })
        .then(() => (success = true));
      await page.evaluate(() => (globalThis.__FOO = 'hit'));
      expect(success).toBe(false);
      await page.evaluate(() =>
        document.body.appendChild(document.createElement('div'))
      );
      await watchdog;
    });
    it('should poll on mutation async', async () => {
      const { page } = getTestState();

      let success = false;
      const watchdog = page
        .waitForFunction(async () => globalThis.__FOO === 'hit', {
          polling: 'mutation',
        })
        .then(() => (success = true));
      await page.evaluate(async () => (globalThis.__FOO = 'hit'));
      expect(success).toBe(false);
      await page.evaluate(async () =>
        document.body.appendChild(document.createElement('div'))
      );
      await watchdog;
    });
    it('should poll on raf', async () => {
      const { page } = getTestState();

      const watchdog = page.waitForFunction(() => globalThis.__FOO === 'hit', {
        polling: 'raf',
      });
      await page.evaluate(() => (globalThis.__FOO = 'hit'));
      await watchdog;
    });
    it('should poll on raf async', async () => {
      const { page } = getTestState();

      const watchdog = page.waitForFunction(
        async () => globalThis.__FOO === 'hit',
        {
          polling: 'raf',
        }
      );
      await page.evaluate(async () => (globalThis.__FOO = 'hit'));
      await watchdog;
    });
    it('should work with strict CSP policy', async () => {
      const { page, server } = getTestState();

      server.setCSP('/empty.html', 'script-src ' + server.PREFIX);
      await page.goto(server.EMPTY_PAGE);
      let error = null;
      await Promise.all([
        page
          .waitForFunction(() => globalThis.__FOO === 'hit', { polling: 'raf' })
          .catch((error_) => (error = error_)),
        page.evaluate(() => (globalThis.__FOO = 'hit')),
      ]);
      expect(error).toBe(null);
    });
    it('should throw on bad polling value', async () => {
      const { page } = getTestState();

      let error = null;
      try {
        await page.waitForFunction(() => !!document.body, {
          polling: 'unknown',
        });
      } catch (error_) {
        error = error_;
      }
      expect(error).toBeTruthy();
      expect(error.message).toContain('polling');
    });
    it('should throw negative polling interval', async () => {
      const { page } = getTestState();

      let error = null;
      try {
        await page.waitForFunction(() => !!document.body, { polling: -10 });
      } catch (error_) {
        error = error_;
      }
      expect(error).toBeTruthy();
      expect(error.message).toContain('Cannot poll with non-positive interval');
    });
    it('should return the success value as a JSHandle', async () => {
      const { page } = getTestState();

      expect(await (await page.waitForFunction(() => 5)).jsonValue()).toBe(5);
    });
    it('should return the window as a success value', async () => {
      const { page } = getTestState();

      expect(await page.waitForFunction(() => window)).toBeTruthy();
    });
    it('should accept ElementHandle arguments', async () => {
      const { page } = getTestState();

      await page.setContent('<div></div>');
      const div = await page.$('div');
      let resolved = false;
      const waitForFunction = page
        .waitForFunction((element) => !element.parentElement, {}, div)
        .then(() => (resolved = true));
      expect(resolved).toBe(false);
      await page.evaluate((element: HTMLElement) => element.remove(), div);
      await waitForFunction;
    });
    it('should respect timeout', async () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      await page
        .waitForFunction('false', { timeout: 10 })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
      expect(error.message).toContain('waiting for function failed: timeout');
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should respect default timeout', async () => {
      const { page, puppeteer } = getTestState();

      page.setDefaultTimeout(1);
      let error = null;
      await page.waitForFunction('false').catch((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      expect(error.message).toContain('waiting for function failed: timeout');
    });
    it('should disable timeout when its set to 0', async () => {
      const { page } = getTestState();

      const watchdog = page.waitForFunction(
        () => {
          globalThis.__counter = (globalThis.__counter || 0) + 1;
          return globalThis.__injected;
        },
        { timeout: 0, polling: 10 }
      );
      await page.waitForFunction(() => globalThis.__counter > 10);
      await page.evaluate(() => (globalThis.__injected = true));
      await watchdog;
    });
    it('should survive cross-process navigation', async () => {
      const { page, server } = getTestState();

      let fooFound = false;
      const waitForFunction = page
        .waitForFunction('globalThis.__FOO === 1')
        .then(() => (fooFound = true));
      await page.goto(server.EMPTY_PAGE);
      expect(fooFound).toBe(false);
      await page.reload();
      expect(fooFound).toBe(false);
      await page.goto(server.CROSS_PROCESS_PREFIX + '/grid.html');
      expect(fooFound).toBe(false);
      await page.evaluate(() => (globalThis.__FOO = 1));
      await waitForFunction;
      expect(fooFound).toBe(true);
    });
    it('should survive navigations', async () => {
      const { page, server } = getTestState();

      const watchdog = page.waitForFunction(() => globalThis.__done);
      await page.goto(server.EMPTY_PAGE);
      await page.goto(server.PREFIX + '/consolelog.html');
      await page.evaluate(() => (globalThis.__done = true));
      await watchdog;
    });
  });

  describe('Page.waitForTimeout', () => {
    it('waits for the given timeout before resolving', async () => {
      const { page, server } = getTestState();
      await page.goto(server.EMPTY_PAGE);
      const startTime = Date.now();
      await page.waitForTimeout(1000);
      const endTime = Date.now();
      /* In a perfect world endTime - startTime would be exactly 1000 but we
       * expect some fluctuations and for it to be off by a little bit. So to
       * avoid a flaky test we'll make sure it waited for roughly 1 second.
       */
      expect(endTime - startTime).toBeGreaterThan(700);
      expect(endTime - startTime).toBeLessThan(1300);
    });
  });

  describe('Frame.waitForTimeout', () => {
    it('waits for the given timeout before resolving', async () => {
      const { page, server } = getTestState();
      await page.goto(server.EMPTY_PAGE);
      const frame = page.mainFrame();
      const startTime = Date.now();
      await frame.waitForTimeout(1000);
      const endTime = Date.now();
      /* In a perfect world endTime - startTime would be exactly 1000 but we
       * expect some fluctuations and for it to be off by a little bit. So to
       * avoid a flaky test we'll make sure it waited for roughly 1 second
       */
      expect(endTime - startTime).toBeGreaterThan(700);
      expect(endTime - startTime).toBeLessThan(1300);
    });
  });

  describe('Frame.waitForSelector', function () {
    const addElement = (tag) =>
      document.body.appendChild(document.createElement(tag));

    it('should immediately resolve promise if node exists', async () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      const frame = page.mainFrame();
      await frame.waitForSelector('*');
      await frame.evaluate(addElement, 'div');
      await frame.waitForSelector('div');
    });

    it('should work with removed MutationObserver', async () => {
      const { page } = getTestState();

      await page.evaluate(() => delete window.MutationObserver);
      const [handle] = await Promise.all([
        page.waitForSelector('.zombo'),
        page.setContent(`<div class='zombo'>anything</div>`),
      ]);
      expect(
        await page.evaluate((x: HTMLElement) => x.textContent, handle)
      ).toBe('anything');
    });

    it('should resolve promise when node is added', async () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      const frame = page.mainFrame();
      const watchdog = frame.waitForSelector('div');
      await frame.evaluate(addElement, 'br');
      await frame.evaluate(addElement, 'div');
      const eHandle = await watchdog;
      const tagName = await eHandle
        .getProperty('tagName')
        .then((e) => e.jsonValue());
      expect(tagName).toBe('DIV');
    });

    it('should work when node is added through innerHTML', async () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      const watchdog = page.waitForSelector('h3 div');
      await page.evaluate(addElement, 'span');
      await page.evaluate(
        () =>
          (document.querySelector('span').innerHTML = '<h3><div></div></h3>')
      );
      await watchdog;
    });

    it(
      'Page.waitForSelector is shortcut for main frame',
      async () => {
        const { page, server } = getTestState();

        await page.goto(server.EMPTY_PAGE);
        await utils.attachFrame(page, 'frame1', server.EMPTY_PAGE);
        const otherFrame = page.frames()[1];
        const watchdog = page.waitForSelector('div');
        await otherFrame.evaluate(addElement, 'div');
        await page.evaluate(addElement, 'div');
        const eHandle = await watchdog;
        expect(eHandle.executionContext().frame()).toBe(page.mainFrame());
      }
    );

    it('should run in specified frame', async () => {
      const { page, server } = getTestState();

      await utils.attachFrame(page, 'frame1', server.EMPTY_PAGE);
      await utils.attachFrame(page, 'frame2', server.EMPTY_PAGE);
      const frame1 = page.frames()[1];
      const frame2 = page.frames()[2];
      const waitForSelectorPromise = frame2.waitForSelector('div');
      await frame1.evaluate(addElement, 'div');
      await frame2.evaluate(addElement, 'div');
      const eHandle = await waitForSelectorPromise;
      expect(eHandle.executionContext().frame()).toBe(frame2);
    });

    it('should throw when frame is detached', async () => {
      const { page, server } = getTestState();

      await utils.attachFrame(page, 'frame1', server.EMPTY_PAGE);
      const frame = page.frames()[1];
      let waitError = null;
      const waitPromise = frame
        .waitForSelector('.box')
        .catch((error) => (waitError = error));
      await utils.detachFrame(page, 'frame1');
      await waitPromise;
      expect(waitError).toBeTruthy();
      expect(waitError.message).toContain(
        'waitForFunction failed: frame got detached.'
      );
    });
    it('should survive cross-process navigation', async () => {
      const { page, server } = getTestState();

      let boxFound = false;
      const waitForSelector = page
        .waitForSelector('.box')
        .then(() => (boxFound = true));
      await page.goto(server.EMPTY_PAGE);
      expect(boxFound).toBe(false);
      await page.reload();
      expect(boxFound).toBe(false);
      await page.goto(server.CROSS_PROCESS_PREFIX + '/grid.html');
      await waitForSelector;
      expect(boxFound).toBe(true);
    });
    it('should wait for visible', async () => {
      const { page } = getTestState();

      let divFound = false;
      const waitForSelector = page
        .waitForSelector('div', { visible: true })
        .then(() => (divFound = true));
      await page.setContent(
        `<div style='display: none; visibility: hidden;'>1</div>`
      );
      expect(divFound).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.removeProperty('display')
      );
      expect(divFound).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.removeProperty('visibility')
      );
      expect(await waitForSelector).toBe(true);
      expect(divFound).toBe(true);
    });
    it('should wait for visible recursively', async () => {
      const { page } = getTestState();

      let divVisible = false;
      const waitForSelector = page
        .waitForSelector('div#inner', { visible: true })
        .then(() => (divVisible = true));
      await page.setContent(
        `<div style='display: none; visibility: hidden;'><div id="inner">hi</div></div>`
      );
      expect(divVisible).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.removeProperty('display')
      );
      expect(divVisible).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.removeProperty('visibility')
      );
      expect(await waitForSelector).toBe(true);
      expect(divVisible).toBe(true);
    });
    it('hidden should wait for visibility: hidden', async () => {
      const { page } = getTestState();

      let divHidden = false;
      await page.setContent(`<div style='display: block;'></div>`);
      const waitForSelector = page
        .waitForSelector('div', { hidden: true })
        .then(() => (divHidden = true));
      await page.waitForSelector('div'); // do a round trip
      expect(divHidden).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.setProperty('visibility', 'hidden')
      );
      expect(await waitForSelector).toBe(true);
      expect(divHidden).toBe(true);
    });
    it('hidden should wait for display: none', async () => {
      const { page } = getTestState();

      let divHidden = false;
      await page.setContent(`<div style='display: block;'></div>`);
      const waitForSelector = page
        .waitForSelector('div', { hidden: true })
        .then(() => (divHidden = true));
      await page.waitForSelector('div'); // do a round trip
      expect(divHidden).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.setProperty('display', 'none')
      );
      expect(await waitForSelector).toBe(true);
      expect(divHidden).toBe(true);
    });
    it('hidden should wait for removal', async () => {
      const { page } = getTestState();

      await page.setContent(`<div></div>`);
      let divRemoved = false;
      const waitForSelector = page
        .waitForSelector('div', { hidden: true })
        .then(() => (divRemoved = true));
      await page.waitForSelector('div'); // do a round trip
      expect(divRemoved).toBe(false);
      await page.evaluate(() => document.querySelector('div').remove());
      expect(await waitForSelector).toBe(true);
      expect(divRemoved).toBe(true);
    });
    it('should return null if waiting to hide non-existing element', async () => {
      const { page } = getTestState();

      const handle = await page.waitForSelector('non-existing', {
        hidden: true,
      });
      expect(handle).toBe(null);
    });
    it('should respect timeout', async () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      await page
        .waitForSelector('div', { timeout: 10 })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
      expect(error.message).toContain(
        'waiting for selector `div` failed: timeout'
      );
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should have an error message specifically for awaiting an element to be hidden', async () => {
      const { page } = getTestState();

      await page.setContent(`<div></div>`);
      let error = null;
      await page
        .waitForSelector('div', { hidden: true, timeout: 10 })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
      expect(error.message).toContain(
        'waiting for selector `div` to be hidden failed: timeout'
      );
    });

    it('should respond to node attribute mutation', async () => {
      const { page } = getTestState();

      let divFound = false;
      const waitForSelector = page
        .waitForSelector('.zombo')
        .then(() => (divFound = true));
      await page.setContent(`<div class='notZombo'></div>`);
      expect(divFound).toBe(false);
      await page.evaluate(
        () => (document.querySelector('div').className = 'zombo')
      );
      expect(await waitForSelector).toBe(true);
    });
    it('should return the element handle', async () => {
      const { page } = getTestState();

      const waitForSelector = page.waitForSelector('.zombo');
      await page.setContent(`<div class='zombo'>anything</div>`);
      expect(
        await page.evaluate(
          (x: HTMLElement) => x.textContent,
          await waitForSelector
        )
      ).toBe('anything');
    });
    it('should have correct stack trace for timeout', async () => {
      const { page } = getTestState();

      let error;
      await page
        .waitForSelector('.zombo', { timeout: 10 })
        .catch((error_) => (error = error_));
      expect(error.stack).toContain('waiting for selector `.zombo` failed');
      // The extension is ts here as Mocha maps back via sourcemaps.
      expect(error.stack).toContain('waittask.spec.ts');
    });
  });

  describe('Frame.waitForXPath', function () {
    const addElement = (tag) =>
      document.body.appendChild(document.createElement(tag));

    it('should support some fancy xpath', async () => {
      const { page } = getTestState();

      await page.setContent(`<p>red herring</p><p>hello  world  </p>`);
      const waitForXPath = page.waitForXPath(
        '//p[normalize-space(.)="hello world"]'
      );
      expect(
        await page.evaluate(
          (x: HTMLElement) => x.textContent,
          await waitForXPath
        )
      ).toBe('hello  world  ');
    });
    it('should respect timeout', async () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      await page
        .waitForXPath('//div', { timeout: 10 })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
      expect(error.message).toContain(
        'waiting for XPath `//div` failed: timeout'
      );
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should run in specified frame', async () => {
      const { page, server } = getTestState();

      await utils.attachFrame(page, 'frame1', server.EMPTY_PAGE);
      await utils.attachFrame(page, 'frame2', server.EMPTY_PAGE);
      const frame1 = page.frames()[1];
      const frame2 = page.frames()[2];
      const waitForXPathPromise = frame2.waitForXPath('//div');
      await frame1.evaluate(addElement, 'div');
      await frame2.evaluate(addElement, 'div');
      const eHandle = await waitForXPathPromise;
      expect(eHandle.executionContext().frame()).toBe(frame2);
    });
    it('should throw when frame is detached', async () => {
      const { page, server } = getTestState();

      await utils.attachFrame(page, 'frame1', server.EMPTY_PAGE);
      const frame = page.frames()[1];
      let waitError = null;
      const waitPromise = frame
        .waitForXPath('//*[@class="box"]')
        .catch((error) => (waitError = error));
      await utils.detachFrame(page, 'frame1');
      await waitPromise;
      expect(waitError).toBeTruthy();
      expect(waitError.message).toContain(
        'waitForFunction failed: frame got detached.'
      );
    });
    it('hidden should wait for display: none', async () => {
      const { page } = getTestState();

      let divHidden = false;
      await page.setContent(`<div style='display: block;'></div>`);
      const waitForXPath = page
        .waitForXPath('//div', { hidden: true })
        .then(() => (divHidden = true));
      await page.waitForXPath('//div'); // do a round trip
      expect(divHidden).toBe(false);
      await page.evaluate(() =>
        document.querySelector('div').style.setProperty('display', 'none')
      );
      expect(await waitForXPath).toBe(true);
      expect(divHidden).toBe(true);
    });
    it('should return the element handle', async () => {
      const { page } = getTestState();

      const waitForXPath = page.waitForXPath('//*[@class="zombo"]');
      await page.setContent(`<div class='zombo'>anything</div>`);
      expect(
        await page.evaluate(
          (x: HTMLElement) => x.textContent,
          await waitForXPath
        )
      ).toBe('anything');
    });
    it('should allow you to select a text node', async () => {
      const { page } = getTestState();

      await page.setContent(`<div>some text</div>`);
      const text = await page.waitForXPath('//div/text()');
      expect(await (await text.getProperty('nodeType')).jsonValue()).toBe(
        3 /* Node.TEXT_NODE */
      );
    });
    it('should allow you to select an element with single slash', async () => {
      const { page } = getTestState();

      await page.setContent(`<div>some text</div>`);
      const waitForXPath = page.waitForXPath('/html/body/div');
      expect(
        await page.evaluate(
          (x: HTMLElement) => x.textContent,
          await waitForXPath
        )
      ).toBe('some text');
    });
  });
});