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<p><a href="https://reliasoftware.com/blog/what-is-end-to-end-testing">End-to-end (E2E) testing</a> involves running your software on a real device or a simulator and interacting with it as a user would. This ensures that all components of your application work together correctly. Detox, created by Wix, is a <a href="https://reliasoftware.com/blog/javascript-frameworks">JavaScript testing framework</a> for mobile apps, providing excellent abstractions for selecting and performing actions on components.</p>
<p>In this blog, I will show you guys the simplest steps to use Detox for E2E testing in your React Native application. By the end of this guide, you'll have a basic understanding of how to apply Detox to your project.</p>
<p>&gt;&gt;&nbsp;<em>Read more: Top 5 <a href="https://reliasoftware.com/blog/top-5-react-native-app-development-companies">React Native App Development Companies</a></em></p>
<h2>What is Detox?</h2>
<p><strong>Detox is a JavaScript <a href="https://reliasoftware.com/blog/end-to-end-testing-tool-and-frameworks">end-to-end testing framework</a> for mobile apps. It provides tools and APIs to test your app's quality and behavior, ensuring it looks great, operates well, and runs properly on phones and tablets.</strong>&nbsp;Amazing projects like <code>react-native-navigation</code> and <code>react-native-ui-lib</code> are also maintained by Wix.</p>
<p>Detox offers tools and special code (APIs) to test your app's quality and behaviour. Detox framework guarantees your software looks great, operates well, and runs properly on phones and tablets.</p>
<p>A typical Detox test looks like this:</p>
<pre class="language-javascript"><code>/* eslint-env detox/detox, mocha */
import { by, device, expect, element } from 'detox';

describe('Example', () =&gt; {
  beforeAll(async () =&gt; {
    await device.launchApp();
  });

  beforeEach(async () =&gt; {
    await device.reloadReactNative();
  });

  it('should have welcome screen', async () =&gt; {
    await expect(element(by.text('username-input'))).toBeVisible();
  });
});
</code></pre>
<p>The syntax looks very similar to what we usually do with <a href="https://reliasoftware.com/blog/what-is-unit-testing">unit tests</a>.</p>
<h2>4 Steps for Implementing React Native End-to-End Testing with Detox</h2>
<h3>Step 1: Setting Up React Native Project</h3>
<p>First, you'll need to bootstrap a new React Native application. For this example, we'll use a TypeScript template:</p>
<pre class="language-typescript"><code>npx react-native init MyApp --template react-native-template-typescript
</code></pre>
<blockquote>
<p>Note: Detox currently does not support the new React Native architecture.</p>
</blockquote>
<h3>Step 2: Setting Up Detox&nbsp;</h3>
<p><strong>Prerequisites</strong></p>
<p>Ensure you have the following installed:</p>
<ul>
<li>Xcode</li>
<li>Java</li>
<li>Android SDK</li>
<li>Android Emulator</li>
<li>Homebrew (updated)</li>
<li>Node.js</li>
</ul>
<p><strong>Installation Steps</strong></p>
<ul>
<li>Install Detox CLI:</li>
</ul>
<pre class="language-javascript"><code>yarn global add detox-cli
// or
npm install detox-cli --global
</code></pre>
<ul>
<li>Install AppleSimUtils:</li>
</ul>
<pre class="language-javascript"><code>brew tap wix/brew &amp;&amp; brew install applesimutils
</code></pre>
<ul>
<li>Install Detox and Jest Circus:</li>
</ul>
<pre class="language-javascript"><code>yarn add detox -D
// or
npm install detox --save-dev

yarn add jest-circus -D
</code></pre>
<ul>
<li>Initialize Detox Configuration:</li>
</ul>
<pre class="language-javascript"><code>detox init -r jest
</code></pre>
<p>This will generate the following configuration files:</p>
<ul style="list-style-type: square;">
<li><code>.detoxrc.json</code></li>
<li><code>e2e/config.json</code></li>
<li><code>e2e/environment.json</code></li>
</ul>
<p>You will need to update <code>.detoxrc.json</code> to specify the paths to your app binaries:</p>
<pre class="language-javascript"><code>{
  "testRunner": "jest",
  "runnerConfig": "e2e/config.json",
  "skipLegacyWorkersInjection": true,
  "apps": {
    "ios": {
      "type": "ios.app",
      "build": "xcodebuild -workspace ios/MyApp.xcworkspace -scheme MyApp -configuration Debug -derivedDataPath ios/build",
      "binaryPath": "ios/build/Build/Products/Debug-iphonesimulator/MyApp.app"
    },
    "android": {
      "type": "android.apk",
      "binaryPath": "android/app/build/outputs/apk/debug/app-debug.apk",
      "build": "cd android &amp;&amp; ./gradlew assembleDebug"
    }
  },
  "devices": {
    "simulator": {
      "type": "ios.simulator",
      "device": {
        "type": "iPhone 11"
      }
    },
    "emulator": {
      "type": "android.emulator",
      "device": {
        "avdName": "Pixel_3a_API_30_x86"
      }
    }
  }
}
</code></pre>
<h3>Step 3: Writing Your First Detox React Native Test Case&nbsp;</h3>
<p><strong>Preparing Your Environment</strong></p>
<ul>
<li>Add TypeScript Support:</li>
</ul>
<pre class="language-javascript"><code>yarn add ts-jest -D
</code></pre>
<ul>
<li>Add ESLint Plugin for Detox:</li>
</ul>
<pre class="language-javascript"><code>yarn add eslint-plugin-detox -D
</code></pre>
<ul>
<li>Update <code>.eslintrc</code> Configuration:</li>
</ul>
<pre class="language-javascript"><code>{
  "plugins": ["detox"]
}
</code></pre>
<ul>
<li>Update <code>e2e/config.json</code> for TypeScript:</li>
</ul>
<pre class="language-javascript"><code>{
  "preset": "ts-jest",
  "maxWorkers": 1,
  "testEnvironment": "./environment",
  "testRunner": "jest-circus/runner",
  "testTimeout": 120000,
  "testRegex": "\\\\.spec\\\\.ts$",
  "reporters": ["detox/runners/jest/streamlineReporter"],
  "verbose": true
}
</code></pre>
<p><strong>Writing Your First Test Case</strong></p>
<p>Create a file <code>e2e/firstTest.spec.ts</code> with the following content:</p>
<pre class="language-javascript"><code>/* eslint-env detox/detox, mocha */
import { by, device, expect, element } from 'detox';

describe('Example', () =&gt; {
  beforeAll(async () =&gt; {
    await device.launchApp();
  });

  beforeEach(async () =&gt; {
    await device.reloadReactNative();
  });

  it('should have welcome screen', async () =&gt; {
    await expect(element(by.text('Step One'))).toBeVisible();
  });
});
</code></pre>
<h3>Step 4: Running your Detox React Native Test Case</h3>
<ul>
<li>Build Your Application:</li>
</ul>
<pre class="language-javascript"><code>detox build
</code></pre>
<ul>
<li>Run Your Test Cases:</li>
</ul>
<pre class="language-javascript"><code>detox test
</code></pre>
<p>If everything is set up correctly, you will see the following message in your terminal console:</p>
<pre class="language-javascript"><code>PASS e2e/firstTest.spec.js (7.514s)
Example
  ✓ should have welcome screen (260ms)
</code></pre>
<p>&gt;&gt;&nbsp;<em>Read more:</em></p>
<ul>
<li><em>Top 10 <a href="https://reliasoftware.com/blog/top-best-react-and-react-native-IDEs">Best Open Source React &amp; React Native IDEs</a></em></li>
<li><em><a href="https://reliasoftware.com/blog/building-front-end-applications-with-react">An In-Depth Guide for Front-End Development with React</a></em></li>
</ul>
<h2>Conclusion</h2>
<p>Detox is an excellent framework for end-to-end testing of React Native applications. While it offers powerful abstractions and tools, you might occasionally encounter configuration challenges. For any issues, refer to the GitHub issues page and community forums for assistance. Give Detox a try to ensure your app is robust and reliable!</p>
<p>For further reading and support, check out the following resources:</p>
<ul>
<li><a href="https://wix.github.io/Detox/docs/introduction/getting-started/" rel="nofollow noreferrer">Detox Documentation</a></li>
<li><a href="https://reactnative.dev/docs/getting-started" rel="nofollow noreferrer">React Native Documentation</a></li>
<li><a href="https://github.com/wix/Detox/issues" rel="nofollow noreferrer">Detox GitHub Issues</a></li>
<li><a href="https://github.com/facebook/react-native/issues" rel="nofollow noreferrer">React Native GitHub Issues</a></li>
</ul>
<p style="text-align: right;">&gt;&gt;&gt; <em>Follow and Contact <a href="https://reliasoftware.com/">Relia Software</a> for more information!</em></p>
</div>
</div>
</div>
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<p>4 Steps to implement React Native End-to-End Testing with Detox: 1: Setting Up React Native Project; 2: Setting Up Detox; 3: Writing Your First Detox Test Case, etc.</p>

An Ultimate Guide to React Native End-to-End Testing with Detox | Relia Software