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Signups are key transactions in most web platforms, and therefore prime targets for automation. Oftentimes, registering an account is where we will find longer forms asking the user to answer a variety of questions. Luckily, Playwright is quick enough to blaze through these in seconds.

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Steps

The flow will often match the following:
  1. Navigate to the signup form.
  2. Fill in all text fields, check all boxes etc.
  3. Submit the form by clicking a button.
We will likely want to also check that some change occurred in the UI to confirm that the registration worked.
signup.spec.ts
import { test, expect } from '@playwright/test'

test('Sign up', async ({ page }) => {
  await page.goto('https://danube-web.shop/')

  await page.getByRole('button', { name: 'Sign up' }).click()
  await page.getByPlaceholder('Name', { exact: true }).fill('John')
  await page.getByPlaceholder('Surname').fill('Doe')
  await page.getByPlaceholder('Email').fill('user@email.com')
  await page.getByPlaceholder('Password').fill('supersecure1')

  await page.getByPlaceholder('Company (optional)').fill('Test Inc.')
  await page.getByLabel('Myself').check()
  await page.getByLabel('I would like to receive').check()
  await page.getByLabel('I have read and accept the').check()

  await page.getByRole('button', { name: 'Register' }).click()
  await expect(page.getByText('Welcome back, user@email.com')).toBeVisible()
})
Run this example as follows: 
USER_EMAIL=user@email.com USER_PASSWORD=supersecure1 npx playwright test signup.spec.ts

SET USER_EMAIL=user@email.com
SET USER_PASSWORD=supersecure1
npx playwright signup.spec.ts
The normal signup flow might include asking the user to confirm their email address right away by navigating to a URL included in an automated email. Reliably replicating the steps needed to achieve that is not trivial. A possible solution to the issue is having the system under test distinguish between test sessions and normal user sessions, and skip the verification step for test sessions. A way to achieve this would be to check for a specific user agent ID which could be set as part of our test: 
await page.setUserAgent('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 \
(KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 TEST_ID/<MY_SECRET>');

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Takeaways

  1. Use environment variables to inject secrets.
  2. You might need to go through additional steps in case email confirmation or similar is required.