Android Studio Robolectric Test Example

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This example project shows how to use robolectric, junit and assertJ with your gradle-based Android Studio projects. Examine the top-level build.gradle and app/build.gradle files for a new project configuration gradle boilerplate.

Make sure you're running the most recent version of Android Studio from the Canary Channel for this to work correctly (1.2 Beta as of today).

To set up from a new Android Studio Project:

Add test dependencies on assertj-android and Robolectric to your module's build.gradle file. Your app module's app/build.gradle file would look something like this:

apply plugin: 'com.android.application'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.example.joshskeen.myapplication"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    testCompile 'com.squareup.assertj:assertj-android:1.1.0'
    testCompile 'org.robolectric:robolectric:3.0'
}

2. If they don't already exist, create directories matching src/test/java/ and add a package matching your project's packagename. E.g. src/test/java/com.example.joshskeen.myapplication

4. Sync your gradle file by clicking 'Sync Project with Gradle Files'

5. Select "Unit Tests" under "Build Variants"

6. Create your unit test in src/test/java/com.example.joshskeen.myapplication/MyActivityTest.java:

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class MyActivityTest {

   private MyActivity mActivity;

   @Before
   public void setup() {
       mActivity = Robolectric.buildActivity(MyActivity.class).create().get();
   }

   @Test
   public void myActivityAppearsAsExpectedInitially() {
       assertThat(mActivity.mClickMeButton).hasText("Click me!");
       assertThat(mActivity.mHelloWorldTextView).hasText("Hello world!");
   }

   @Test
   public void clickingClickMeButtonChangesHelloWorldText() {
       assertThat(mActivity.mHelloWorldTextView).hasText("Hello world!");
       mActivity.mClickMeButton.performClick();
       assertThat(mActivity.mHelloWorldTextView).hasText("HEY WORLD");
   }

}

7. Ctrl + click (or right-click) on the test and select Run > MyActivityTest. Make sure you select "Gradle" test (rather than unit), indicated by the gradle icon as seen here:

8. Write Robolectric Tests! For more intel on how to write tests using robolectric + assertJ, check out http://blog.bignerdranch.com/2583-testing-the-android-way/