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Expo VS react-testing-library

Compare Expo VS react-testing-library and see what are their differences

Expo logo Expo

The fastest way to build an iOS and Android app ๐Ÿ“ฑ

react-testing-library logo react-testing-library

[`React Testing Library`][gh] builds on top of `DOM Testing Library` by adding
  • Expo Landing page
    Landing page //
    2023-05-11
  • react-testing-library Landing page
    Landing page //
    2022-08-21

Expo features and specs

  • Ease of Use
    Expo simplifies the development process by providing a managed workflow that handles configuration and builds, allowing developers to focus on coding.
  • Cross-Platform Development
    Expo enables developers to write code once and deploy it on both iOS and Android platforms, ensuring a consistent user experience across devices.
  • Pre-Built Components
    Expo offers a library of pre-built components and APIs that streamline the development process and reduce the time needed to implement common functionalities.
  • Over-the-Air Updates
    Developers can push updates to users in real-time without needing to go through the app store review process, facilitating quick bug fixes and feature releases.
  • Strong Community Support
    Expo has a vibrant and active developer community, offering a wealth of resources, tutorials, and third-party packages to assist developers.
  • Integrated Development Environment
    Expo provides tools like Expo CLI and Expo Go that make it easier to build, test, and debug applications, particularly for newcomers to mobile app development.

Possible disadvantages of Expo

  • Custom Native Code Limitations
    Expo's managed workflow restricts the use of custom native code, limiting developers when they need to integrate with third-party native libraries not supported by Expo.
  • Larger App Size
    Expo includes additional libraries and dependencies by default, which can result in a larger application size compared to custom builds.
  • Performance Overhead
    The abstraction added by Expo can introduce performance overhead, making it less suitable for highly performance-sensitive applications.
  • Dependency on Expo's Updates
    Developers are dependent on Expo's update cycle for bug fixes and new features, which may not always align with their project timelines.
  • Limited Configuration Options
    Expo's managed workflow abstracts many configurations for build processes, which can be a hindrance for developers needing granular control over app settings.
  • Ejection Complexity
    Ejecting from the managed workflow to a bare workflow for more customization can be complex and time-consuming, potentially negating some benefits of using Expo.

react-testing-library features and specs

  • Focused on user-centric testing
    React Testing Library encourages tests that closely resemble how users interact with an application. This approach makes tests more reliable and meaningful.
  • Reduces coupling to implementation details
    By encouraging developers to interact with components via the DOM, the library minimizes dependencies on component internals, making tests less prone to breaking from refactors.
  • Improved test readability
    Tests written with React Testing Library are generally easier to read and understand because they focus on what the user sees and does, rather than the internal logic of the components.
  • Comprehensive query options
    The library provides a wide range of query methods (e.g., getByText, getByRole), which makes it easy to select elements in ways that resemble how users think.
  • Active community and well-maintained
    React Testing Library has a strong, active community and it's maintained by experienced developers who keep the library up-to-date with React's evolution.

Possible disadvantages of react-testing-library

  • Limited support for non-DOM testing
    The library is heavily focused on DOM interactions, making it less suited for testing non-DOM logic or scenarios that don't involve user interactions.
  • Can be slower
    Tests that involve the DOM can be slower compared to tests that interact directly with component methods and state, which can lead to longer test execution times.
  • Learning curve for traditional testers
    Developers who are used to testing implementation details with other tools (like Enzyme) might find it challenging to adjust to the user-centric approach advocated by React Testing Library.
  • Potential for less granular control
    Because the library encourages testing through the UI, developers might find it harder to test specific, isolated internal behaviors of components that aren't directly visible to users.
  • Dependencies on browser APIs
    The library's reliance on browser APIs means that tests may behave differently in different environments or may require polyfills for certain features, leading to potential inconsistencies.

Analysis of Expo

Overall verdict

  • Expo is a solid choice for developers looking to quickly build and deploy mobile applications using React Native. Its ease of use and comprehensive toolset make it particularly attractive for rapid prototyping and development of small to medium apps. However, some advanced native functionalities might require ejecting from Expo, which can introduce additional complexities.

Why this product is good

  • Ease of use
    Expo is known for its user-friendly interface that allows developers to quickly prototype and build apps with React Native without needing to set up native development environments.
  • Cross platform
    Expo simplifies the process of building cross-platform applications, giving developers tools to deploy apps for both iOS and Android effortlessly.
  • No native code
    With Expo, developers can build applications entirely in JavaScript, which is beneficial for those who may not be familiar with native coding languages.
  • Developer tools
    It provides a suite of tools such as an interactive development environment, error reporting, and debugging services that enhance the development experience.

Recommended for

    {"beginners" => "New developers who are just getting started with app development will find Expo's simplicity and comprehensive documentation helpful.", "rapid_prototyping" => "Teams seeking to quickly prototype and iterate on ideas can benefit from Expo's convenient tools and cross-platform capabilities.", "react_native_developers" => "Developers familiar with React Native who want a streamlined solution to deploy apps without deep diving into native code."}

Analysis of react-testing-library

Overall verdict

  • React Testing Library is highly regarded in the React community for its simplicity and effective approach to testing React components. Itโ€™s known for promoting good testing practices that result in reliable and maintainable code.

Why this product is good

  • React Testing Library is considered good because it encourages testing practices that closely resemble how users interact with the application. It emphasizes testing components from the user's perspective and discourages testing implementation details, which can lead to more robust and maintainable tests.

Recommended for

  • Developers looking to improve the reliability of their React applications
  • Teams interested in adopting user-centric testing methodologies
  • Projects that prioritize maintainable and understandable test code

Expo videos

Scenes from the 2019 National FFA Convention & Expo | Review Video

More videos:

  • Review - Auto Expo 2020 Film | Real-life review
  • Review - Expo Dry Erase Set Unboxing & Review

react-testing-library videos

React unit testing with Jest & React-testing-library

More videos:

  • Review - Test a React Component that renders a list with react-testing-library

Category Popularity

0-100% (relative to Expo and react-testing-library)
Developer Tools
36 36%
64% 64
Mobile App Builder
100 100%
0% 0
Javascript UI Libraries
0 0%
100% 100
Application Builder
100 100%
0% 0

User comments

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Social recommendations and mentions

Based on our record, react-testing-library should be more popular than Expo. It has been mentiond 137 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Expo mentions (35)

  • Video player with React Native. Part 1: Expo
    We are going to review it in a series of two articles. This is the first one, where we will touch on Expo. Expo is quite popular and is even recommended in Getting Started guide for React Native. But it differs a lot. Here we will go through the process of building an app with Expo and then make technology comparison based on the results. - Source: dev.to / about 2 years ago
  • State Management Nx React Native/Expo Apps with TanStack Query and Redux
    This workspace is created using @nx/expo (Nx and Expo). - Source: dev.to / over 2 years ago
  • New OAuth Vulnerability (CVE-2023-28131) impacts hundreds of websites and Apps
    Just be clear this isn't an OAuth vulnerability. It's an vulnerability in expo.io. It doesn't even really have anything to do with OAuth. They've just terrible return url handling so it probably impacts a lot more than just stealing OAuth tokens. Source: about 3 years ago
  • Convert Reactjs + Firebase Project to a Mobile apk app. Please help
    I haven't messed with React Native in a hot minute, but it should be rather easy to port your React app to React Native. I recall using expo.io in uni for react native development. Hope that helps. Source: over 3 years ago
  • Form Validation in React (Native) using Formik
    Expo: Expo is a free and open source toolchain built around React Native to help you build native iOS and Android projects using JavaScript and React. Expo is a great way to get started with React Native. - Source: dev.to / over 3 years ago
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react-testing-library mentions (137)

  • Test-Driven Development for Building User Interfaces
    React Testing Libraryโ€™s core philosophy is that we should write our tests in such a way that we simulate user behavior. By testing what the user can actually do, our tests focus less on implementation details and more on the actual user interface, which leads to less brittle tests and a more reliable test suite. - Source: dev.to / 5 months ago
  • Chaos-Driven Testing for Full Stack Apps: Integration Tests That Break (and Heal)
    In the main branch, we set up Vitest as the test runner and React Testing Library for rendering the component and simulating user interactions. We also set up MSW to intercept the network requests and return mock responses. - Source: dev.to / 9 months ago
  • ๐Ÿš€ 9 Libraries to Boost Your Productivity as a React Developer
    React Testing Library (RTL) provides lightweight utilities built on top of react-dom and react-dom/test-utils, designed to promote testing through user interactions rather than component internals. Instead of working with component instances, RTL encourages querying and asserting against actual DOM nodes, just like real users would. This approach improves test reliability and pushes developers toward writing more... - Source: dev.to / 11 months ago
  • Best Practices for React Applications
    Testing ensures code reliability and maintainability. Jest, Vitest and React Testing Library are standard tools for unit and integration testing. Unit tests verify individual components, while integration tests ensure features work together. For example, testing a TodoList component might involve:. - Source: dev.to / 12 months ago
  • Migrating from AngularJS to React
    Additionally, I wrote Jest and Enzyme unit tests to demonstrate how to go about unit testing the components, as test driven development (TDD) is another methodology my organization subscribes to. Jest is a unit testing framework that actually shipped with React if you use the Create React App CLI to make a new React project. And at the time, Enzyme was created by Airbnb and added additional functionality to Jest... - Source: dev.to / about 1 year ago
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What are some alternatives?

When comparing Expo and react-testing-library, you can also consider the following products

React Native - A framework for building native apps with React

Jest - Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.

Vitest - A blazing fast unit test framework powered by Vite

Android Studio - Android development environment based on IntelliJ IDEA

Enzyme - Enzyme is a JavaScript testing utility for React.