How to test Hilt in Android?

Testing Hilt in Android involves understanding dependency injection and how to effectively write unit and instrumented tests for your Android components. Hilt simplifies DI by managing the lifecycle of your components and providing a clear structure for testing.

Setting Up Hilt for Testing

To test Hilt, you will need to include the necessary testing dependencies in your build.gradle file:

dependencies { // Other dependencies androidTestImplementation "com.google.dagger:hilt-android-testing:2.37" kaptAndroidTest "com.google.dagger:hilt-compiler:2.37" }

Creating a Hilt Test Runner

To run your tests, create a custom test runner by extending HiltAndroidRule:

@HiltAndroidTest class MyActivityTest { @get:Rule var hiltRule = HiltAndroidRule(this) @Before fun init() { hiltRule.inject() } @Test fun testMyActivity() { // Your test code here } }

Writing Unit Tests with Hilt

When writing unit tests, you can create a test module to provide mock implementations:

@Module @InstallIn(SingletonComponent::class) object TestModule { @Provides fun provideMyService(): MyService { return mock(MyService::class.java) } }

Hilt testing Android Hilt dependency injection testing Android unit tests Hilt test rules

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