Why E2E testing with Playwright in Svelte? - Purpose & Use Cases

The Big Idea

What if your tests could click through your app perfectly every time, catching bugs before users do?

The Scenario

Imagine you have a website with many pages and features. You try every button and link yourself to check if everything works before releasing it.

You open the site, click around, fill forms, and watch if anything breaks.

The Problem

This manual checking takes a lot of time and you might miss some bugs because you get tired or distracted.

Every time you change something, you have to repeat all the clicks again, which is boring and slow.

The Solution

With E2E testing using Playwright, you write scripts that automatically open the website, click buttons, fill forms, and check results for you.

These scripts run fast and exactly the same way every time, so you catch bugs early and save time.

Before vs After

✗ Before

Open browser
Click login
Type username
Type password
Click submit
Check if logged in

✓ After

await page.goto('https://example.com/login')
await page.fill('#username', 'user')
await page.fill('#password', 'pass')
await page.click('button[type=submit]')
await expect(page).toHaveURL(/\/dashboard/)

What It Enables

You can quickly and confidently test your whole app like a real user, every time you make changes.

Real Life Example

A team building an online store uses Playwright tests to check that adding items to the cart and completing checkout always works, even after updates.

Key Takeaways

Manual testing is slow and easy to miss bugs.

Playwright automates user actions to test the whole app end-to-end.

This saves time and improves confidence in your app's quality.