Live e2e test debugging for a distributed serverless application

Ivan’s first attempts at performance debugging were chaotic. He would see a slow interaction, try a random optimization, see that it didn't help, and keep trying other optimizations until he found the right one (or gave up).
Back then, Ivan didn’t know how to use performance devtools well. He would do a recording in Chrome DevTools or React Profiler, poke around it, try clicking random things, and then close it in frustration a few minutes later. Now, Ivan knows exactly where and what to look for. And in this workshop, Ivan will teach you that too.
Here’s how this is going to work. We’ll take a slow app → debug it (using tools like Chrome DevTools, React Profiler, and why-did-you-render) → pinpoint the bottleneck → and then repeat, several times more. We won’t talk about the solutions (in 90% of the cases, it’s just the ol’ regular useMemo() or memo()). But we’ll talk about everything that comes before – and learn how to analyze any React performance problem, step by step.
(Note: This workshop is best suited for engineers who are already familiar with how useMemo() and memo() work – but want to get better at using the performance tools around React. Also, we’ll be covering interaction performance, not load speed, so you won’t hear a word about Lighthouse 🤐)

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

In this workshop, we discuss the merits of serverless architecture and how it can be applied to the AI space. We'll explore options around building serverless RAG applications for a more lambda-esque approach to AI. Next, we'll get hands on and build a sample CRUD app that allows you to store information and query it using an LLM with Workers AI, Vectorize, D1, and Cloudflare Workers.

Frontend issues that affect your users are often triggered by backend problems. In this workshop, you’ll learn how to identify issues causing slow web pages and poor Core Web Vitals using tracing.
Then, try it for yourself by setting up Sentry in a ready-made Next.js project to discover performance issues including slow database queries in an interactive pair-programming session.
You’ll leave the workshop being able to:- Find backend issues that might be slowing down your frontend apps- Setup tracing with Sentry in a Next.js project- Debug and fix poor performance issues using tracing
This will be a live 2-hour event where you’ll have the opportunity to code along with us and ask us questions.

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

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.

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.