Robolectric strategies | Test your app on Android

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href="https://developer-android-com.translate.goog/design/ui/xr?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android XR" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> Android XR </span> </a></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/design/ui/widget?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Widgets" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> Widgets </span> </a></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/design/ui/wear?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " 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tooltip> Testing </span> </a></li> <li class="devsite-nav-item devsite-nav-heading"><span class="devsite-nav-title" tooltip> <span class="devsite-nav-text" tooltip> Quality </span> </span></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/quality?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Overview" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> Overview </span> </a></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/quality/core-value?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Core value" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> Core value </span> </a></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/quality/user-experience?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: User experience" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> User experience </span> </a></li> <li class="devsite-nav-item"><a href="https://developer-android-com.translate.goog/guide/topics/ui/accessibility?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Accessibility" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip> Accessibility </span> </a></li> <li class="devsite-nav-item"><a 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track-metadata-eventdetail="Test your app on Android"> Test your app on Android </a></li> </ul><devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1">Robolectric strategies</h1><devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"> <devsite-view-release-notes></devsite-view-release-notes> </div><devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded> </devsite-toc> <devsite-recommendations-dropdown class="nocontent"></devsite-recommendations-dropdown> <div class="devsite-article-body clearfix "> <p><a href="https://translate.google.com/website?sl=auto&tl=en&hl=auto&u=https://robolectric.org/" class="external">Robolectric</a> is an open-source framework maintained by Google that lets you run tests in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. It supports all versions of Android since Lollipop (API level 21).</p> <p>Many big projects use Robolectric to increase the speed and reliability of their tests and reduce the expenses associated with running tests on real devices or emulators. This includes most Google apps which rely heavily on Robolectric.</p> <p>Robolectric is not a complete replacement for an emulator because it doesn't support all the features and APIs. For example, Robolectric doesn't have a screen like an emulator does, and some APIs are only partially supported. However, it emulates enough parts of Android to run unit tests and most UI tests reliably.</p> <h2 id="testing-strategies" data-text="Testing strategies" tabindex="-1">Testing strategies</h2> <p>There are two types of testing strategies you can pursue with Robolectric: unit testing and UI testing.</p> <h3 id="unit-testing" data-text="Unit testing" tabindex="-1">Unit testing</h3> <p>Robolectric was conceived as a way to enable "unit testing" in Android apps. For example, you can simulate the launch of an Activity and test the logic inside it, calling all the lifecycle methods.</p> <p>You can also use Robolectric's fakes (called shadows) as dependencies for unit tests. For example, if your class uses a Bundle or you need to fake a <a href="https://translate.google.com/website?sl=auto&tl=en&hl=auto&u=https://github.com/robolectric/robolectric/blob/ae831fccdc10b5808c274fbe519a5a8deae33424/shadows/framework/src/main/java/org/robolectric/shadows/BluetoothConnectionManager.java%23L12" class="external">Bluetooth</a> connection.</p> <p>In general, if you implement a <a href="https://developer-android-com.translate.goog/training/testing/fundamentals?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto#architecture">testable architecture</a> you shouldn't need to use Robolectric for unit testing as your code should be testable in isolation, with no dependencies on the Android framework.</p> <aside class="key-point"> <strong>Key Point:</strong><span> In most cases, only use Robolectric for unit testing as a last resort: with legacy code or when using APIs that depend on Android classes. When possible, refactor your code so that it's testable without Robolectric shadows, or test the feature using a different type of test, such as a UI test.</span> </aside> <h3 id="ui-testing" data-text="UI testing" tabindex="-1">UI testing</h3> <p>Robolectric can also run <a href="https://developer-android-com.translate.goog/training/testing/ui-tests?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto">UI tests</a> such as Espresso or Compose tests. You can convert an <a href="https://developer-android-com.translate.goog/training/testing/instrumented-tests?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto">instrumented</a> test to Robolectric by moving it to the <code translate="no" dir="ltr">test</code> source set and setting up the Robolectric dependencies.</p> <div></div><devsite-code> <pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><code translate="no" dir="ltr"><span class="devsite-syntax-n">android</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">testOptions</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">unitTests</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">isIncludeAndroidResources</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">true</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-n">dependencies</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">testImplementation</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"junit:junit:4.13.2"</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">testImplementation</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"org.robolectric:robolectric:4.13"</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">}</span> </code></pre> </devsite-code> <p>Any UI test present in the <code translate="no" dir="ltr">test</code> source set runs with Robolectric.</p> <div></div><devsite-code> <pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><code translate="no" dir="ltr"><span class="devsite-syntax-k">import</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nn">androidx.test.espresso.Espresso.onView</span> <span class="devsite-syntax-nd">@RunWith</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">AndroidJUnit4</span><span class="devsite-syntax-o">::</span><span class="devsite-syntax-n">class</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-kd">class</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nc">AddContactActivityTest</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nd">@Test</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-kd">fun</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nf">inputTextShouldBeRetainedAfterActivityRecreation</span><span class="devsite-syntax-p">()</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// GIVEN</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">contactName</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"Test User"</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">scenario</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ActivityScenario</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">launchActivity<AddContactActivity></span><span class="devsite-syntax-p">()</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// WHEN</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Enter contact name</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">onView</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">withId</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">R</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">id</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">contact_name_text</span><span class="devsite-syntax-p">))</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">perform</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">typeText</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">contactName</span><span class="devsite-syntax-p">))</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Destroy and recreate Activity</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">scenario</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">recreate</span><span class="devsite-syntax-p">()</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// THEN</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Check contact name was preserved.</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">onView</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">withId</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">R</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">id</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">contact_name_text</span><span class="devsite-syntax-p">))</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">check</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">matches</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">withText</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">contactName</span><span class="devsite-syntax-p">)))</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-p">}</span> </code></pre> </devsite-code> <p>Most UI tests don't interact with the framework and you can run them on Robolectric. You can run behavior tests on Robolectric as the fidelity needed for it is more than enough. For example, when a Compose test verifies that the UI has changed after clicking a button.</p> <p>You can run other UI tests with Robolectric, such as screenshot tests. However the fidelity is lower as different devices render screens slightly differently.</p> <p>You must decide whether Robolectric's implementation is good enough for each use case, but here are some recommendations:</p> <ul> <li>Use Robolectric for isolated UI behavior tests for components, feature or application tests. In general these tests check the state management and behavior of the UIs and don't interact with external dependencies.</li> <li>Use Robolectric to take screenshots when the pixel accuracy is not critical. For example, to test how a component reacts to different font sizes or themes.</li> </ul> <p><strong>Note</strong>: Robolectric can take screenshots natively, but you need a third-party library to perform screenshot testing with it.</p> <h2 id="robolectric-versus" data-text="Robolectric versus device tests" tabindex="-1">Robolectric versus device tests</h2> <p>In summary, Robolectric provides enough fidelity to run most UI tests but some cases will still require device tests, for example those related to system UI like edge-to-edge or picture-in-picture, or when relying on unsupported features, like <code translate="no" dir="ltr">WebView</code>.</p><devsite-hats-survey class="nocontent" hats-id="VxqvKSur40kxBYCLVTd0SSGykbno" listnr-id="5207477"></devsite-hats-survey> </div><devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Content and code samples on this page are subject to the licenses described in the <a href="https://developer-android-com.translate.goog/license?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=auto">Content License</a>. 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