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jest-puppeteer

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jest-puppeteer

Run your tests using Jest & Puppeteer.

  • 6.2.0
  • Source
  • npm
  • Socket score

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2
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What is jest-puppeteer?

jest-puppeteer is a Jest preset that allows you to use Puppeteer, a headless Chrome Node API, for end-to-end testing. It simplifies the setup and configuration needed to use Puppeteer with Jest, enabling you to write tests that interact with web pages in a browser-like environment.

What are jest-puppeteer's main functionalities?

Setup and Teardown

jest-puppeteer provides a simple way to configure global setup and teardown scripts, as well as a custom test environment for running Puppeteer tests.

module.exports = {
  globalSetup: './setup.js',
  globalTeardown: './teardown.js',
  testEnvironment: './puppeteer_environment.js'
};

Writing Tests

You can write tests using Jest's syntax, and use Puppeteer's API to interact with the web page. In this example, the test navigates to Google's homepage and checks if the text 'google' is present.

describe('Google', () => {
  beforeAll(async () => {
    await page.goto('https://google.com');
  });

  it('should display "google" text on page', async () => {
    await expect(page).toMatch('google');
  });
});

Custom Matchers

jest-puppeteer allows you to extend Jest with custom matchers that can be used to assert conditions specific to Puppeteer. This example shows how to create a custom matcher to check if an element's text includes a specific string.

expect.extend({
  async toMatchText(received, argument) {
    const text = await received.evaluate(el => el.textContent);
    if (text.includes(argument)) {
      return {
        message: () => `expected ${text} to include ${argument}`,
        pass: true
      };
    } else {
      return {
        message: () => `expected ${text} to include ${argument}`,
        pass: false
      };
    }
  }
});

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Package last updated on 11 Dec 2022

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