How to use Robolectric 2.4 in Android Studio 1.1.0 & gradle 2.2.1

Question

I am unable to configure my Android Studio Project with Robolectric. Could any one guide me step by step to build an android studio 1.1.0 project with Robolectric 2.4 & gradle 2.2.1

This sample projects work fine https://github.com/robolectric/deckard-gradle. But I am not able to implement it in my existing Android Studio projects.

//below are the detailed description

---

//Contents Of of project build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

---

//Contents Of app/src/build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "robo.testing.android.testrobo08"
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets { main { java.srcDirs = ['src/main/java'] } }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'

    // Test Compile
    testCompile 'junit:junit:4.12'
    testCompile 'org.robolectric:robolectric:2.4'
    testCompile "org.mockito:mockito-core:1.9.5"
}

---

//Contents Of MainActivityTest

package robo.testing.android.testrobo08.test;

import android.app.Activity;
import android.widget.TextView;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;

import robo.testing.android.testrobo08.MainActivity;
import robo.testing.android.testrobo08.R;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;

/**
 * Created by cflap584 on 13/3/15.
 */

@RunWith(RobolectricTestRunner.class)
@Config(manifest = "./src/main/AndroidManifest.xml", emulateSdk = 18)

public class MainActivityTest {
    Activity activity = Robolectric.buildActivity(MainActivity.class).create().get();

    TextView textView = (TextView) activity.findViewById(R.id.myTextView);

    @Test
    public void testTextView_lableName() throws Exception {
        String actual = textView.getText().toString();
        assertThat("Hello World!", equalTo(actual));
    }


}

---

//ERROR

robo.testing.android.testrobo08.test.MainActivityTest > testTextView_lableName STANDARD_ERROR
    WARNING: no system properties value for ro.build.date.utc

robo.testing.android.testrobo08.test.MainActivityTest > testTextView_lableName STANDARD_OUT
    DEBUG: Loading resources for robo.testing.android.testrobo08 from ././src/main/res...
    DEBUG: Loading resources for android from jar:/home/cflap584/.m2/repository/org/robolectric/android-all/4.3_r2-robolectric-0/android-all-4.3_r2-robolectric-0.jar!/res...
Gradle Test Executor 1 finished executing tests.

robo.testing.android.testrobo08.test.MainActivityTest > testTextView_lableName FAILED
    java.lang.RuntimeException: Could not find any resource  from reference ResName{robo.testing.android.testrobo08:style/Theme_AppCompat_Light_DarkActionBar} from style StyleData{name='AppTheme', parent='Theme_AppCompat_Light_DarkActionBar'} with theme null
        at org.robolectric.shadows.ShadowAssetManager$StyleResolver.getParent(ShadowAssetManager.java:456)
        at org.robolectric.shadows.ShadowAssetManager$StyleResolver.getAttrValue(ShadowAssetManager.java:394)
        at org.robolectric.shadows.ShadowResources.getOverlayedThemeValue(ShadowResources.java:294)
        at org.robolectric.shadows.ShadowResources.findAttributeValue(ShadowResources.java:283)
        at org.robolectric.shadows.ShadowResources.attrsToTypedArray(ShadowResources.java:186)
        at org.robolectric.shadows.ShadowResources.access$000(ShadowResources.java:44)
        at org.robolectric.shadows.ShadowResources$ShadowTheme.obtainStyledAttributes(ShadowResources.java:491)
        at org.robolectric.shadows.ShadowResources$ShadowTheme.obtainStyledAttributes(ShadowResources.java:486)
        at org.robolectric.shadows.ShadowResources$ShadowTheme.obtainStyledAttributes(ShadowResources.java:481)
        at android.content.res.Resources$Theme.obtainStyledAttributes(Resources.java)
        at android.content.Context.obtainStyledAttributes(Context.java:380)
        at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:147)
        at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138)
        at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)
        at robo.testing.android.testrobo08.MainActivity.onCreate(MainActivity.java:13)
        at android.app.Activity.performCreate(Activity.java:5133)
        at org.robolectric.internal.ReflectionHelpers$3.run(ReflectionHelpers.java:64)
        at org.robolectric.internal.ReflectionHelpers.traverseClassHierarchy(ReflectionHelpers.java:114)
        at org.robolectric.internal.ReflectionHelpers.callInstanceMethodReflectively(ReflectionHelpers.java:59)
        at org.robolectric.util.ActivityController$1.run(ActivityController.java:115)
        at org.robolectric.shadows.ShadowLooper.runPaused(ShadowLooper.java:268)
        at org.robolectric.util.ActivityController.create(ActivityController.java:111)
        at org.robolectric.util.ActivityController.create(ActivityController.java:122)
        at robo.testing.android.testrobo08.test.MainActivityTest.<init>(MainActivityTest.java:26)

Answer 1

I found the problem. In my case it was not able to find the AndroidManifest.xml file & i haven't use customRobolectricTestRunner.

Project Structure

  Gradle Version 2.2.1
  Android Plugin Version 1.1.0

project build.gradle file's content

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

App build.gradle file's content

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "robo.testing.android.testrobo"
        minSdkVersion 16
        targetSdkVersion 18
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets { main { java.srcDirs = ['src/main/java'] } }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'


// Test Compile
    testCompile 'junit:junit:4.12'
    testCompile 'org.robolectric:robolectric:2.4'
    testCompile "org.mockito:mockito-core:1.9.5"
}

Build Variants

Test Artificat : Unit Tests

I found some reference for my solution https://github.com/robolectric/robolectric/issues/1592
@erd If you are using Gradle / Android Studio, you need to create a custom test runner that will tell Robolectric where to find your merged assets, resources, and manifest. Please see the discussion here:

http://nenick-android.blogspot.in/2015/03/android-studio-110-and-robolectric-30.html

content of src/test/java/packageName.test/CustomRobolectricRunner.java

 public CustomRobolectricRunner(Class<?> testClass)
            throws InitializationError {
        super(testClass);
        String buildVariant = (BuildConfig.FLAVOR.isEmpty()
                ? "" : BuildConfig.FLAVOR+ "/") + BuildConfig.BUILD_TYPE;
        String intermediatesPath = BuildConfig.class.getResource("")
                .toString().replace("file:", "");
        intermediatesPath = intermediatesPath
                .substring(0, intermediatesPath.indexOf("/classes"));

        System.setProperty("android.package", 
                BuildConfig.APPLICATION_ID);
        System.setProperty("android.manifest",
                intermediatesPath + "/manifests/full/" 
                        + buildVariant + "/AndroidManifest.xml");
        System.setProperty("android.resources", 
                intermediatesPath + "/res/" + buildVariant);
        System.setProperty("android.assets", 
                intermediatesPath + "/assets/" + buildVariant);
    }

Content of MainActivityTest.java

package robo.testing.android.testrobo.test;

import android.app.Activity;
import android.widget.TextView;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;

import robo.testing.android.testrobo.MainActivity;
import robo.testing.android.testrobo.R;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsEqual.equalTo;

/**
 * Created by cflap584 on 16/3/15.
 */

@RunWith(CustomRobolectricTestRunner.class)
public class MainActivityTest {
    Activity activity = Robolectric.buildActivity(MainActivity.class).create().get();
    TextView textView = (TextView) activity.findViewById(R.id.myTextView);

    @Test
    public void testTextView_labelName() throws Exception {
        String actual = textView.getText().toString();
        assertThat("Hello world!", equalTo(actual));

    }

}