Everyone Can Easily Write Tests

Rate this content
Bookmark

Let’s take a look at how Playwright can help you get your end to end tests written with tools like Codegen that generate tests on user interaction. Let’s explore UI mode for a better developer experience and then go over some tips to make sure you don’t have flakey tests. Then let’s talk about how to get your tests up and running on CI, debugging on CI and scaling using shards.

Debbie O'Brien
Debbie O'Brien
21 min
11 Dec, 2023

Comments

Sign in or register to post your comment.

Video Summary and Transcription

Playwright is a reliable end-to-end testing tool for modern web apps that provides one API, full isolation, fast execution, and supports multiple languages. It offers features like auto-weighting, retrying assertions, seamless testing of iframes and shadow DOM, test isolation, parallelism, and scalability. Playwright provides tools like VS Code extension, UiMode, and Trace Viewer for writing, debugging, and running tests. Effective tests prioritize user-facing attributes, use playwright locators and assertions, and avoid testing third-party dependencies. Playwright simplifies testing by generating tests, providing code generation and UI mode, and allows for easy running and debugging of tests. It helps in fixing failed tests and analyzing DOM changes, fixing locator mismatches, and scaling tests. Playwright is open source, free, and continuously growing.

Available in Español

1. Introduction to Playwright

Short description:

Everyone can easily write tests. Playwright is reliable end-to-end testing for modern web apps on any browser. It provides one API, full isolation, fast execution, and supports multiple languages. There are many more reasons to use Playwright, but let's focus on these for now.

Everyone can easily write tests. Hey everyone, my name is Debbie O'Brien, I'm a senior technical PM at Microsoft advocating for Playwright and ensuring you are all writing tests. That tests is easy, it's fun and it's something that anyone can do. So, don't be afraid because at the end of this talk we're all gonna be like oh my god I need to write tests like right now. So, bare with me.

Yes, if you want to follow me, debbs underscore O'Brien on Twitter or X or whatever you're calling it these days as well as all the other social media platforms out there, debbie.code is my website. And let's get straight into talking about Playwright because that's why we are here today. So, what is Playwright? For those of you that do not know, I've never heard of Playwright. Where have you been, seriously? Playwright is reliable end-to-end testing for your modern web apps and it works on any browser. So you can be on like a Windows and you can test on WebKit for example, one API, all your tests run in full isolation, they're really really fast. We've got some amazing tooling which we'll go into today and it is multi-language. So, I'm going to show you TypeScript, but you could write in JavaScript of course or also in Python, Java or .NET.

So, why playwright? I mean, all those reasons that I've just shown you just here, but also there's so many more, but I'm just going to concentrate on those and we'll go through them step by step. And there are so many other reasons, but seriously, you should be using Playwright in the story.

2. Playwright Features

Short description:

Playwright provides auto-weighting, retrying assertions, seamless testing of iframes and shadow DOM, test isolation, parallelism, and scalability for faster test execution.

So Playwright auto-weighting, what does that mean? So for example, imagine Playwright needs to click on a button. Now Playwright is like a really, really fast user. You know it's really like frustrated fast users. So what happens when maybe the JavaScript isn't ready or the button isn't properly loaded in the DOM and therefore it's not fully clickable? Well, Playwright will wait for that to be ready. So it's auto-weighting for that element, which means you don't have to write any artificial timeouts or anything like that. So that's really cool.

So if you're using the Playwright assertions, they will retry out of the box. What does that mean? Well, imagine you have expect that button to be visible and it's going to wait for that button to actually be visible and it will retry until it is or until the timeout runs out. So out of the box retrying assertions.

Now, what if you want to test iframes and shadow DOM? Well, it just works. You don't have to install anything, no new plugins or anything like that. You can just test the iframe or test the shadow DOM just like you would test your normal elements on the page. Test isolation. Really important. So look at the test tubes here. Now imagine your test is inside a test tube and your next test is inside another test tube. Well, it's exactly like that. So nothing from one test tube will go into the other test tube, which means later on if test B fails, well, it's not because of test A because that has nothing to do with between those tests because they are running in full isolation, and that's how Playwright works out of the box.

Parallelism. Really important. Your tests run in parallel. So, it's like, imagine your tests are those swimmers and they're just running all the way until the end, right? Imagine if you had to wait for one swimmer to get to the end and then the next swimmer would go and then the next swimmer would go. That would be really, really slow. Playwright is not slow. Playwright is super fast. Works in parallel by default. With sharding, you can also scale, so imagine you're on CI and you want to run even faster, then you can basically shard across multiple machines and have your tests, say five tests run one machine, five on the other, five on the other, etc. Making your tests run even faster. Probably best not to use those machines. Should get better machines than those, but you know what I mean.

Check out more articles and videos

We constantly think of articles and videos that might spark Git people interest / skill us up or help building a stellar career

Network Requests with Cypress
TestJS Summit 2021TestJS Summit 2021
33 min
Network Requests with Cypress
Top Content
Whether you're testing your UI or API, Cypress gives you all the tools needed to work with and manage network requests. This intermediate-level task demonstrates how to use the cy.request and cy.intercept commands to execute, spy on, and stub network requests while testing your application in the browser. Learn how the commands work as well as use cases for each, including best practices for testing and mocking your network requests.
Testing Pyramid Makes Little Sense, What We Can Use Instead
TestJS Summit 2021TestJS Summit 2021
38 min
Testing Pyramid Makes Little Sense, What We Can Use Instead
Top Content
Featured Video
Gleb Bahmutov
Roman Sandler
2 authors
The testing pyramid - the canonical shape of tests that defined what types of tests we need to write to make sure the app works - is ... obsolete. In this presentation, Roman Sandler and Gleb Bahmutov argue what the testing shape works better for today's web applications.
Testing Web Applications with Playwright
TestJS Summit 2022TestJS Summit 2022
20 min
Testing Web Applications with Playwright
Top Content
Testing is hard, testing takes time to learn and to write, and time is money. As developers we want to test. We know we should but we don't have time. So how can we get more developers to do testing? We can create better tools.Let me introduce you to Playwright - Reliable end-to-end cross browser testing for modern web apps, by Microsoft and fully open source. Playwright's codegen generates tests for you in JavaScript, TypeScript, Dot Net, Java or Python. Now you really have no excuses. It's time to play your tests wright.
Full-Circle Testing With Cypress
TestJS Summit 2022TestJS Summit 2022
27 min
Full-Circle Testing With Cypress
Top Content
Cypress has taken the world by storm by brining an easy to use tool for end to end testing. It’s capabilities have proven to be be useful for creating stable tests for frontend applications. But end to end testing is just a small part of testing efforts. What about your API? What about your components? Well, in my talk I would like to show you how we can start with end-to-end tests, go deeper with component testing and then move up to testing our API, circ
Test Effective Development
TestJS Summit 2021TestJS Summit 2021
31 min
Test Effective Development
Top Content
Developers want to sleep tight knowing they didn't break production. Companies want to be efficient in order to meet their customer needs faster and to gain competitive advantage sooner. We ALL want to be cost effective... or shall I say... TEST EFFECTIVE!But how do we do that?Are the "unit" and "integration" terminology serves us right?Or is it time for a change? When should we use either strategy to maximize our "test effectiveness"?In this talk I'll show you a brand new way to think about cost effective testing with new strategies and new testing terms!It’s time to go DEEPER!
Playwright Test Runner
TestJS Summit 2021TestJS Summit 2021
25 min
Playwright Test Runner
Top Content

Workshops on related topic

Designing Effective Tests With React Testing Library
React Summit 2023React Summit 2023
151 min
Designing Effective Tests With React Testing Library
Top Content
Featured Workshop
Josh Justice
Josh Justice
React Testing Library is a great framework for React component tests because there are a lot of questions it answers for you, so you don’t need to worry about those questions. But that doesn’t mean testing is easy. There are still a lot of questions you have to figure out for yourself: How many component tests should you write vs end-to-end tests or lower-level unit tests? How can you test a certain line of code that is tricky to test? And what in the world are you supposed to do about that persistent act() warning?
In this three-hour workshop we’ll introduce React Testing Library along with a mental model for how to think about designing your component tests. This mental model will help you see how to test each bit of logic, whether or not to mock dependencies, and will help improve the design of your components. You’ll walk away with the tools, techniques, and principles you need to implement low-cost, high-value component tests.
Table of contents- The different kinds of React application tests, and where component tests fit in- A mental model for thinking about the inputs and outputs of the components you test- Options for selecting DOM elements to verify and interact with them- The value of mocks and why they shouldn’t be avoided- The challenges with asynchrony in RTL tests and how to handle them
Prerequisites- Familiarity with building applications with React- Basic experience writing automated tests with Jest or another unit testing framework- You do not need any experience with React Testing Library- Machine setup: Node LTS, Yarn
How to Start With Cypress
TestJS Summit 2022TestJS Summit 2022
146 min
How to Start With Cypress
Featured WorkshopFree
Filip Hric
Filip Hric
The web has evolved. Finally, testing has also. Cypress is a modern testing tool that answers the testing needs of modern web applications. It has been gaining a lot of traction in the last couple of years, gaining worldwide popularity. If you have been waiting to learn Cypress, wait no more! Filip Hric will guide you through the first steps on how to start using Cypress and set up a project on your own. The good news is, learning Cypress is incredibly easy. You'll write your first test in no time, and then you'll discover how to write a full end-to-end test for a modern web application. You'll learn the core concepts like retry-ability. Discover how to work and interact with your application and learn how to combine API and UI tests. Throughout this whole workshop, we will write code and do practical exercises. You will leave with a hands-on experience that you can translate to your own project.
Detox 101: How to write stable end-to-end tests for your React Native application
React Summit 2022React Summit 2022
117 min
Detox 101: How to write stable end-to-end tests for your React Native application
Top Content
WorkshopFree
Yevheniia Hlovatska
Yevheniia Hlovatska
Compared to unit testing, end-to-end testing aims to interact with your application just like a real user. And as we all know it can be pretty challenging. Especially when we talk about Mobile applications.
Tests rely on many conditions and are considered to be slow and flaky. On the other hand - end-to-end tests can give the greatest confidence that your app is working. And if done right - can become an amazing tool for boosting developer velocity.
Detox is a gray-box end-to-end testing framework for mobile apps. Developed by Wix to solve the problem of slowness and flakiness and used by React Native itself as its E2E testing tool.
Join me on this workshop to learn how to make your mobile end-to-end tests with Detox rock.
Prerequisites- iOS/Android: MacOS Catalina or newer- Android only: Linux- Install before the workshop
API Testing with Postman Workshop
TestJS Summit 2023TestJS Summit 2023
48 min
API Testing with Postman Workshop
Top Content
WorkshopFree
Pooja Mistry
Pooja Mistry
In the ever-evolving landscape of software development, ensuring the reliability and functionality of APIs has become paramount. "API Testing with Postman" is a comprehensive workshop designed to equip participants with the knowledge and skills needed to excel in API testing using Postman, a powerful tool widely adopted by professionals in the field. This workshop delves into the fundamentals of API testing, progresses to advanced testing techniques, and explores automation, performance testing, and multi-protocol support, providing attendees with a holistic understanding of API testing with Postman.
1. Welcome to Postman- Explaining the Postman User Interface (UI)2. Workspace and Collections Collaboration- Understanding Workspaces and their role in collaboration- Exploring the concept of Collections for organizing and executing API requests3. Introduction to API Testing- Covering the basics of API testing and its significance4. Variable Management- Managing environment, global, and collection variables- Utilizing scripting snippets for dynamic data5. Building Testing Workflows- Creating effective testing workflows for comprehensive testing- Utilizing the Collection Runner for test execution- Introduction to Postbot for automated testing6. Advanced Testing- Contract Testing for ensuring API contracts- Using Mock Servers for effective testing- Maximizing productivity with Collection/Workspace templates- Integration Testing and Regression Testing strategies7. Automation with Postman- Leveraging the Postman CLI for automation- Scheduled Runs for regular testing- Integrating Postman into CI/CD pipelines8. Performance Testing- Demonstrating performance testing capabilities (showing the desktop client)- Synchronizing tests with VS Code for streamlined development9. Exploring Advanced Features - Working with Multiple Protocols: GraphQL, gRPC, and more
Join us for this workshop to unlock the full potential of Postman for API testing, streamline your testing processes, and enhance the quality and reliability of your software. Whether you're a beginner or an experienced tester, this workshop will equip you with the skills needed to excel in API testing with Postman.
Testing Web Applications Using Cypress
TestJS Summit - January, 2021TestJS Summit - January, 2021
173 min
Testing Web Applications Using Cypress
WorkshopFree
Gleb Bahmutov
Gleb Bahmutov
This workshop will teach you the basics of writing useful end-to-end tests using Cypress Test Runner.
We will cover writing tests, covering every application feature, structuring tests, intercepting network requests, and setting up the backend data.
Anyone who knows JavaScript programming language and has NPM installed would be able to follow along.
Best Practices for Writing and Debugging Cypress Tests
TestJS Summit 2023TestJS Summit 2023
148 min
Best Practices for Writing and Debugging Cypress Tests
Workshop
Filip Hric
Filip Hric
You probably know the story. You’ve created a couple of tests, and since you are using Cypress, you’ve done this pretty quickly. Seems like nothing is stopping you, but then – failed test. It wasn’t the app, wasn’t an error, the test was… flaky? Well yes. Test design is important no matter what tool you will use, Cypress included. The good news is that Cypress has a couple of tools behind its belt that can help you out. Join me on my workshop, where I’ll guide you away from the valley of anti-patterns into the fields of evergreen, stable tests. We’ll talk about common mistakes when writing your test as well as debug and unveil underlying problems. All with the goal of avoiding flakiness, and designing stable test.