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intro
Introduction
Introduction

The problem

You want to write maintainable tests for your React Native application. You love Kent Dodds' Testing Library, and you want to be able to write maintainable tests for your React Native application. You don't want to use a library that renders components to a fake DOM, and you've had a hard time finding what you need to write tests using that philosophy in React Native.

This solution

React Native Testing Library (RNTL) is an implementation of the well-known Testing Library API that works for React Native. The primary goal is to mimic the testing library API as closely as possible while still accounting for the differences in the platforms. Accomplishing this is no small feat because of the differences between the two platforms. Although most framework implementations like React Testing Library (RTL) are thin layers over DOM Testing Library (DTL), this library needed to have its own base implementation as well as a user-facing API. This library uses the react-test-renderer, whereas DOM Testing Library (DTL) uses JSDOM. The main philosophy here is that you should find elements on the "screen" the way users would. This approach is meant to give you confidence that your app is working as a cohesive unit. Testing Library's primary philosophy is:

The more your tests resemble the way your software is used, the more confidence they can give you.

This library gives you the tools you need to find things in your application the way your users would. You can do things like find elements by text, input value, and accessibility labels -- the types of things your users can see. We also give you the ability to search for elements by testID, but you should consider it a last resort because users can't see a testID and it can introduce unpredictable behavior in your tests.

It will also encourage you to build more accessible apps. For example, disabled users can't see a touchable icon that doesn't have an accessibility label, so neither can your tests. We believe that writing good tests using this library will force you to give more consideration to whether what you're doing is an accessible experience for all of your users.

This library may work with any any testing framework like Jest or Mocha, but we do recommend you use Jest with the react-native Jest preset. We have not tested it in any other environment, and likely won't be able to support usage with another library.

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