#unit testing

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Unit testing is a type of software testing in which individual units of code, such as functions, classes, and modules, are tested to determine if they are fit for use. In JavaScript, unit tests are created to verify that the code behaves as expected when given certain inputs. Unit tests are typically written using a test framework like Jest or Mocha and are run automatically to ensure that the code works correctly.
We May Not Need Component Testing
Vue.js Live 2024Vue.js Live 2024
26 min
We May Not Need Component Testing
Component testing is a gray area between integration and unit testing. The demo app focuses on the cart component and writing test cases for Playwright component test and VTest. The first cart test encounters a bug with the invisible method in View Test.
The Art of ‘Humble Views’: Testing React Native Apps the Smart Way
TestJS Summit 2023TestJS Summit 2023
32 min
The Art of ‘Humble Views’: Testing React Native Apps the Smart Way
This Talk discusses the challenges of testing in React and React Native applications, particularly with regards to barcode scanning. It explores the violation of separation of concerns in React and proposes the use of the HumbleObject model to simplify testing and improve code cleanliness. The MVP model is also introduced as a way to separate UI state and logic from the component. The importance of following patterns, standardization, and teaching principles is emphasized, along with the benefits of using custom hooks to share business logic. The potential of AI tools in code refactoring is mentioned as well.
Test Effective Development
TestJS Summit 2021TestJS Summit 2021
31 min
Test Effective Development
Top Content
This Talk introduces Test Effective Development, a new approach to testing that aims to make companies more cost-effective. The speaker shares their personal journey of improving code quality and reducing bugs through smarter testing strategies. They discuss the importance of finding a balance between testing confidence and efficiency and introduce the concepts of isolated and integrated testing. The speaker also suggests different testing strategies based on the size of the application and emphasizes the need to choose cost-effective testing approaches based on the specific project requirements.
Learn To Use Composables: The Swiss Army Knife Of Vue Developers
Vue.js Live 2024Vue.js Live 2024
163 min
Learn To Use Composables: The Swiss Army Knife Of Vue Developers
Workshop
Juan Andrés Núñez Charro
Juan Andrés Núñez Charro
Composables (composition functions) are stateful/stateless functions that can leverage Vue's reactivity API, decoupling it from components.This shift in perspective opens the possibility for tackling common scenarios in a new and creative way. In this workshop, you will learn how to solve typical problems every Vue developer faces, using composables:
- Data store;- Component cross-communication;- Utility functions (DOM, API, etc);And more.
Zen and the Art of UI Components Testing
TestJS Summit 2023TestJS Summit 2023
21 min
Zen and the Art of UI Components Testing
The Talk discusses the evolution of test automation from the original test automation pyramid to the testing pyramid. It explores modern approaches to UI component testing, including isolations and testing with a fake DOM. The importance of testing in a real browser and the emergence of tools like Selenium, WebDriver.io, Puppeteer, Cypress, and PlayWrite for browser automation are highlighted. The advantages of out-of-process browser automation are explained, along with the use of Storybook and Playwright for testing components. The distinction between end-to-end testing and component testing is also mentioned.
Testing Library: Everybody Uses It, But Nobody Understands It
TestJS Summit 2023TestJS Summit 2023
22 min
Testing Library: Everybody Uses It, But Nobody Understands It
This Talk is about a developer's first open source contribution to the Testing Library, exploring how it works and its importance in testing. It discusses the challenges of testing in a Node environment and the use of getByRole query to find elements. The Talk also highlights the complexities of implicit roles and the need for specific attributes to filter elements. It emphasizes the importance of verifying visibility and accessibility when querying elements and the process of test clean up.
Mock Service Worker 2.0
TestJS Summit 2023TestJS Summit 2023
27 min
Mock Service Worker 2.0
MSW is an API mocking library that simplifies the process of intercepting requests and mocking responses. It leverages standard JavaScript APIs like the ServiceWorker API and the Fetch API. MSW has seen significant adoption, with over 90,000 projects on GitHub and 2.5 million weekly downloads on npm. The recent release of Node.js 18 has allowed for refactoring and simplification in MSW. MSW supports TypeScript and can be used for contract testing with tools like PACT I-O.
Component Testing With Vitest
TestJS Summit 2023TestJS Summit 2023
29 min
Component Testing With Vitest
This Talk explores the challenges of choosing and learning testing frameworks, emphasizing the importance of planning, automation, and prioritizing unit testing. The VTEST framework is introduced as a fast and stable option for unit testing JavaScript and TypeScript code, with a focus on logic and mocking external dependencies. The Talk also covers testing React hooks, integration testing with TestingLibraryReact, component testing, and achieving code coverage. Best practices include performing accessibility tests, planning tests before coding, and using data test IDs for stability.
Using Tests for What?!
TestJS Summit 2022TestJS Summit 2022
11 min
Using Tests for What?!
Today's Talk introduces VEST, a form validation framework that combines the syntax and style of Unitest with form validation. The lack of structure in form validation is a major problem, leading to messy and difficult-to-maintain code. Testing forms and form validation can be challenging, especially with complex logic. VEST offers a solution by allowing the creation of a form validation suite using unit tests. It provides features like multiple validations per field, async validations, and memoization, with support for any JavaScript environment and full TypeScript support.
Unit Testing Angular Applications
TestJS Summit 2022TestJS Summit 2022
24 min
Unit Testing Angular Applications
This talk explores unit testing in Angular applications, covering topics such as testing front-end applications, specifics of testing Angular, best practices, and educational resources. It discusses the anatomy of a unit test in both Jasmine and Jest, the setup and initial tests in Angular, testing user interaction and event handlers, testing rendered output and change detection, and unit testing parent components with child components. It also highlights best practices like using test doubles, testing components with dependency injection, and considerations for unit testing. Code coverage is emphasized as a metric that doesn't guarantee bug-free code.
Introduction to React Native Testing Library
React Advanced Conference 2022React Advanced Conference 2022
131 min
Introduction to React Native Testing Library
Workshop
Josh Justice
Josh Justice
Are you satisfied with your test suites? If you said no, you’re not alone—most developers aren’t. And testing in React Native is harder than on most platforms. How can you write JavaScript tests when the JS and native code are so intertwined? And what in the world are you supposed to do about that persistent act() warning? Faced with these challenges, some teams are never able to make any progress testing their React Native app, and others end up with tests that don’t seem to help and only take extra time to maintain.
But it doesn’t have to be this way. React Native Testing Library (RNTL) is a great library for component testing, and with the right mental model you can use it to implement tests that are low-cost and high-value. In this three-hour workshop you’ll learn the tools, techniques, and principles you need to implement tests that will help you ship your React Native app with confidence. You’ll walk away with a clear vision for the goal of your component tests and with techniques that will help you address any obstacle that gets in the way of that goal.you will know:- The different kinds React Native 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 text, image, and native code elements to verify and interact with them- The value of mocks and why they shouldn’t be avoided- The challenges with asynchrony in RNTL tests and how to handle them- Options for handling native functions and components in your JavaScript tests
Prerequisites:- Familiarity with building applications with React Native- Basic experience writing automated tests with Jest or another unit testing framework- You do not need any experience with React Native Testing Library- Machine setup: Node 16.x or 18.x, Yarn, be able to successfully create and run a new Expo app following the instructions on https://docs.expo.dev/get-started/create-a-new-app/
Who is Testing the Tests?
TestJS Summit 2021TestJS Summit 2021
8 min
Who is Testing the Tests?
Mutation testing is a method to improve test quality by inserting bugs into code to test if tests can detect them. Mutation-testing frameworks like Striker.js allow for various mutations to be performed. Mutation testing provides a mutation score that is a better tool than code coverage for measuring test quality. It can help identify missing tests or bugs in existing tests. Stryker is recommended for JavaScript and TypeScript mutation testing.
How to Catch a11y Defects During Unit and E2E Testing
TestJS Summit 2021TestJS Summit 2021
7 min
How to Catch a11y Defects During Unit and E2E Testing
This Talk provides ways to catch accessibility defects during testing, including adding accessibility testing to a website for Studio Ghibli using React, NX, Jazz, JazzX, Cypress, and CypressX. The importance of unitizing components and conducting end-to-end testing with Cypress and CypressX is emphasized to ensure accessibility. The process of setting up CypressX testing is explained, highlighting the use of typings and the CypressX support file. These tools make it easier for developers to avoid accessibility bugs during development.
It's a (Testing) Trap! - Common Testing Pitfalls and How to Solve Them
TestJS Summit 2021TestJS Summit 2021
20 min
It's a (Testing) Trap! - Common Testing Pitfalls and How to Solve Them
This Talk explores the pain points and best practices in software testing, emphasizing the importance of simplicity and comprehensibility in test design. It discusses techniques such as the three-part rule for test titles, the triple-A pattern for test structure, and the use of clear and descriptive names in tests. The Talk also highlights the traps of testing implementation details and using fixed waiting times. The speaker encourages teamwork and learning from experience to improve testing practices.
Testing React Hooks with Confidence
TestJS Summit - January, 2021TestJS Summit - January, 2021
7 min
Testing React Hooks with Confidence
The Talk discusses testing hooks in a React application. The speaker starts by showing an untested React application and begins testing with a simple placeholder test. The importance of refactoring and testing custom hooks is emphasized, with the recommendation to use the React hooks library and achieve full test coverage. Unit testing React components may not be valuable, as the complexity lies in the hook code. Instead, end-to-end testing with tools like Cypress is recommended.