playwright/tests/page/page-wait-for-function.spec.ts

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/**
* Copyright 2018 Google Inc. All rights reserved.
* Modifications 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 as it, expect } from './pageTest';
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it('should timeout', async ({ page }) => {
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const startTime = Date.now();
const timeout = 42;
await page.waitForTimeout(timeout);
expect(Date.now() - startTime).not.toBeLessThan(timeout / 2);
});
it('should accept a string', async ({ page }) => {
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const watchdog = page.waitForFunction('window.__FOO === 1');
await page.evaluate(() => window['__FOO'] = 1);
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await watchdog;
});
it('should work when resolved right before execution context disposal', async ({ page }) => {
await page.addInitScript(() => window['__RELOADED'] = true);
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await page.waitForFunction(() => {
if (!window['__RELOADED'])
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window.location.reload();
return true;
});
});
it('should poll on interval', async ({ page, server }) => {
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const polling = 100;
const timeDelta = await page.waitForFunction(() => {
if (!window['__startTime']) {
window['__startTime'] = Date.now();
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return false;
}
return Date.now() - window['__startTime'];
}, {}, { polling });
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expect(await timeDelta.jsonValue()).not.toBeLessThan(polling);
});
it('should avoid side effects after timeout', async ({ page }) => {
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let counter = 0;
page.on('console', () => ++counter);
const error = await page.waitForFunction(() => {
window['counter'] = (window['counter'] || 0) + 1;
console.log(window['counter']);
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}, {}, { polling: 1, timeout: 1000 }).catch(e => e);
const savedCounter = counter;
await page.waitForTimeout(2000); // Give it some time to produce more logs.
expect(error.message).toContain('page.waitForFunction: Timeout 1000ms exceeded');
expect(counter).toBe(savedCounter);
});
it('should throw on polling:mutation', async ({ page }) => {
// @ts-expect-error mutation is not a valid polling strategy
const error = await page.waitForFunction(() => true, {}, { polling: 'mutation' }).catch(e => e);
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expect(error.message).toContain('Unknown polling option: mutation');
});
it('should poll on raf', async ({ page }) => {
const watchdog = page.waitForFunction(() => window['__FOO'] === 'hit', {}, { polling: 'raf' });
await page.evaluate(() => window['__FOO'] = 'hit');
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await watchdog;
});
it('should fail with predicate throwing on first call', async ({ page }) => {
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const error = await page.waitForFunction(() => { throw new Error('oh my'); }).catch(e => e);
expect(error.message).toContain('oh my');
});
it('should fail with predicate throwing sometimes', async ({ page }) => {
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const error = await page.waitForFunction(() => {
window['counter'] = (window['counter'] || 0) + 1;
if (window['counter'] === 3)
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throw new Error('Bad counter!');
return window['counter'] === 5 ? 'result' : false;
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}).catch(e => e);
expect(error.message).toContain('Bad counter!');
});
it('should fail with ReferenceError on wrong page', async ({ page }) => {
// @ts-ignore
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const error = await page.waitForFunction(() => globalVar === 123).catch(e => e);
expect(error.message).toContain('globalVar');
});
it('should work with strict CSP policy', async ({ page, server }) => {
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server.setCSP('/empty.html', 'script-src ' + server.PREFIX);
await page.goto(server.EMPTY_PAGE);
let error = null;
await Promise.all([
page.waitForFunction(() => window['__FOO'] === 'hit', {}, { polling: 'raf' }).catch(e => error = e),
page.evaluate(() => window['__FOO'] = 'hit')
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]);
expect(error).toBe(null);
});
it('should throw on bad polling value', async ({ page }) => {
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let error = null;
try {
// @ts-expect-error 'unknown' is not a valid polling strategy
await page.waitForFunction(() => !!document.body, {}, { polling: 'unknown' });
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} catch (e) {
error = e;
}
expect(error).toBeTruthy();
expect(error.message).toContain('polling');
});
it('should throw negative polling interval', async ({ page }) => {
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let error = null;
try {
await page.waitForFunction(() => !!document.body, {}, { polling: -10 });
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} catch (e) {
error = e;
}
expect(error).toBeTruthy();
expect(error.message).toContain('Cannot poll with non-positive interval');
});
it('should return the success value as a JSHandle', async ({ page }) => {
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expect(await (await page.waitForFunction(() => 5)).jsonValue()).toBe(5);
});
it('should return the window as a success value', async ({ page }) => {
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expect(await page.waitForFunction(() => window)).toBeTruthy();
});
it('should accept ElementHandle arguments', async ({ page }) => {
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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 => element.remove(), div);
await waitForFunction;
});
it('should respect timeout', async ({ page, playwright }) => {
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let error = null;
await page.waitForFunction('false', {}, { timeout: 10 }).catch(e => error = e);
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expect(error).toBeTruthy();
expect(error.message).toContain('page.waitForFunction: Timeout 10ms exceeded');
expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
});
it('should respect default timeout', async ({ page, playwright }) => {
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page.setDefaultTimeout(1);
let error = null;
await page.waitForFunction('false').catch(e => error = e);
expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
expect(error.message).toContain('page.waitForFunction: Timeout 1ms exceeded');
});
it('should disable timeout when its set to 0', async ({ page }) => {
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const watchdog = page.waitForFunction(() => {
window['__counter'] = (window['__counter'] || 0) + 1;
return window['__injected'];
}, {}, { timeout: 0, polling: 10 });
await page.waitForFunction(() => window['__counter'] > 10);
await page.evaluate(() => window['__injected'] = true);
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await watchdog;
});
it('should survive cross-process navigation', async ({ page, server }) => {
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let fooFound = false;
const waitForFunction = page.waitForFunction('window.__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(() => window['__FOO'] = 1);
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await waitForFunction;
expect(fooFound).toBe(true);
});
it('should survive navigations', async ({ page, server }) => {
const watchdog = page.waitForFunction(() => window['__done']);
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await page.goto(server.EMPTY_PAGE);
await page.goto(server.PREFIX + '/consolelog.html');
await page.evaluate(() => window['__done'] = true);
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await watchdog;
});
it('should work with multiline body', async ({ page }) => {
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const result = await page.waitForFunction(`
(() => true)()
`);
expect(await result.jsonValue()).toBe(true);
});
it('should wait for predicate with arguments', async ({ page }) => {
await page.waitForFunction(({ arg1, arg2 }) => arg1 + arg2 === 3, { arg1: 1, arg2: 2 });
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});
it('should not be called after finishing successfully', async ({ page, server }) => {
await page.goto(server.EMPTY_PAGE);
const messages = [];
page.on('console', msg => {
if (msg.text().startsWith('waitForFunction'))
messages.push(msg.text());
});
await page.waitForFunction(() => {
console.log('waitForFunction1');
return true;
});
await page.reload();
await page.waitForFunction(() => {
console.log('waitForFunction2');
return true;
});
await page.reload();
await page.waitForFunction(() => {
console.log('waitForFunction3');
return true;
});
expect(messages.join('|')).toBe('waitForFunction1|waitForFunction2|waitForFunction3');
});
it('should not be called after finishing unsuccessfully', async ({ page, server }) => {
await page.goto(server.EMPTY_PAGE);
const messages = [];
page.on('console', msg => {
if (msg.text().startsWith('waitForFunction'))
messages.push(msg.text());
});
await page.waitForFunction(() => {
console.log('waitForFunction1');
throw new Error('waitForFunction1');
}).catch(e => null);
await page.reload();
await page.waitForFunction(() => {
console.log('waitForFunction2');
throw new Error('waitForFunction2');
}).catch(e => null);
await page.reload();
await page.waitForFunction(() => {
console.log('waitForFunction3');
throw new Error('waitForFunction3');
}).catch(e => null);
expect(messages.join('|')).toBe('waitForFunction1|waitForFunction2|waitForFunction3');
});