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What are some beginner-friendly tips and resources for using Playwright to test GraphQL applications, and can the 'faker' library be used for login authentication?

Answer

Getting Started with GraphQL Testing in Playwright

To begin testing GraphQL applications with @playwright/test, first familiarize yourself with GraphQL basics through online tutorials and courses. Once you have a solid understanding, you can start using Playwright's built-in locators to find elements on the webpage. These locators come with auto-waiting and retry-ability features, making your tests more resilient. Prioritize user-facing attributes and explicit contracts when using locators.

Test Isolation

Ensure each test runs independently with its own local storage, session storage, data, and cookies. Test isolation improves reproducibility, simplifies debugging, and prevents cascading test failures. Use before and after hooks to avoid repetition in your tests.

Using Faker for Login Authentication

Yes, you can use the 'faker' library for login authentication in your Playwright tests. Faker generates random usernames or passwords, which can be helpful during login authentication tests.

import { test } from '@playwright/test';
import faker from 'faker';

test('login with faker', async ({ page }) => {
  await page.goto('https://ray.run/login');
  
  const username = faker.internet.userName();
  const password = faker.internet.password();
  
  await page.fill('#username', username);
  await page.fill('#password', password);
  await page.click('#login-button');
});

Working with APIs and Databases

When testing with third-party dependencies, only test what you control. External sites or servers may change unexpectedly, causing unpredictable test failures. Instead, use Playwright's APIRequestContext methods to send HTTP(S) requests over the network and validate server-side post-conditions after running actions in the browser.

import { test } from '@playwright/test';

test('API testing with Playwright', async ({ context }) => {
  const response = await context.request.post('https://ray.run/api/graphql', {
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      query: '{ user(id: 1) { name } }',
    }),
  });

  const data = await response.json();
  expect(data.user.name).toBe('John Doe');
});

For more tips and best practices, check out Tips for Writing Efficient Playwright Test Scripts and API testing using Playwright.

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Rayrun is a community for QA engineers. I am constantly looking for new ways to add value to people learning Playwright and other browser automation frameworks. If you have feedback, email luc@ray.run.