Develop Reference

Android unit test are failing with initializationError if RunWith RobolectricTestRunner

My Android unit test is failing with initializationError if RunWith RobolectricTestRunner.
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.robolectric.RobolectricTestRunner;
import static junit.framework.Assert.assertEquals;
#RunWith(RobolectricTestRunner.class) // If I use #RunWith(Junit4.class) it works
#Config(application = Application.class)
public class LoginActivityTest {
#Test
public void sampleTest() {
assertEquals("actualMessage", "expectedErrorMessage");
}
}
Here is the entire stacktrace:
java.lang.TypeNotPresentException: Type [unknown] not present
at java.base/java.lang.reflect.Method.getDefaultValue(Method.java:682)
at java.base/sun.reflect.annotation.AnnotationType.<init>(AnnotationType.java:132)
at java.base/sun.reflect.annotation.AnnotationType.getInstance(AnnotationType.java:85)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:267)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:121)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:73)
at java.base/java.lang.Class.createAnnotationData(Class.java:3757)
at java.base/java.lang.Class.annotationData(Class.java:3746)
at java.base/java.lang.Class.getAnnotation(Class.java:3651)
at com.intellij.junit4.JUnit4TestRunnerUtil.buildRequest(JUnit4TestRunnerUtil.java:213)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:47)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.lang.NoClassDefFoundError: android/app/Application
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:398)
at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
at java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at java.base/sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:440)
at java.base/sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:421)
at java.base/sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:350)
at java.base/java.lang.reflect.Method.getDefaultValue(Method.java:674)
... 13 more
Caused by: java.lang.ClassNotFoundException: android.app.Application
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 31 more
testImplementation in build.gradle for robolectric is 'org.robolectric:robolectric:4.8.1'
jdk version 11
api level 31
gradle version 4.10.1
android studio ChipMunk
Please help! Thank You!

java.lang.RuntimeException: Failed to instantiate test runner class androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner

I keep getting a RuntimeException whenever I execute my test:
package com.example.mytipcalculator
import androidx.test.espresso.Espresso.onView
import androidx.test.espresso.action.ViewActions
import androidx.test.espresso.action.ViewActions.click
import androidx.test.espresso.action.ViewActions.typeText
import androidx.test.espresso.assertion.ViewAssertions.matches
import androidx.test.espresso.matcher.ViewMatchers.withId
import androidx.test.espresso.matcher.ViewMatchers.withText
import androidx.test.ext.junit.rules.ActivityScenarioRule
import androidx.test.ext.junit.runners.AndroidJUnit4
import org.hamcrest.Matchers.containsString
import org.junit.Rule
import org.junit.runner.RunWith
#RunWith(AndroidJUnit4::class)
class CalculatorTests() {
#get:Rule
val activity = ActivityScenarioRule(MainActivity::class.java)
fun test(){
onView(withId(R.id.cost_of_service_edit_text))
.perform(typeText("50.00"))
.perform(ViewActions.closeSoftKeyboard())
onView(withId(R.id.increase))
.perform(click())
onView(withId(R.id.increase))
.perform(click())
onView(withId(R.id.increase))
.perform(click())
onView(withId(R.id.increase))
.perform(click())
onView(withId(R.id.increase))
.perform(click())
onView(withId(R.id.calculate_button))
.perform(click())
onView(withId(R.id.tip_result))
.check(matches(withText(containsString("$10.00"))))
onView(withId(R.id.totalexpense))
.check(matches(withText(containsString("$60.00"))))
}
}
When I run the previous code, I get the following initialization error:
java.lang.RuntimeException: Failed to instantiate test runner class androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner
Test class class com.example.mytipcalculator.CalculatorTests is malformed. (1 problems):
java.lang.Exception: No runnable methods
at androidx.test.ext.junit.runners.AndroidJUnit4.throwInitializationError(AndroidJUnit4.java:129)
at androidx.test.ext.junit.runners.AndroidJUnit4.loadRunner(AndroidJUnit4.java:121)
at androidx.test.ext.junit.runners.AndroidJUnit4.loadRunner(AndroidJUnit4.java:82)
at androidx.test.ext.junit.runners.AndroidJUnit4.<init>(AndroidJUnit4.java:56)
... 14 trimmed
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at androidx.test.ext.junit.runners.AndroidJUnit4.loadRunner(AndroidJUnit4.java:112)
... 17 more
Caused by: org.junit.runners.model.InitializationError
at org.junit.runners.ParentRunner.validate(ParentRunner.java:418)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
at androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner.<init>(AndroidJUnit4ClassRunner.java:43)
at androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner.<init>(AndroidJUnit4ClassRunner.java:48)
... 20 more

You have to annotate test() method with #Test annotation:
#Test
fun test() {
...
}

Can't get an INSTANCE of a DB using the AndroidViewModel superclass and Room

In my MVVM app, I am extending AndroidViewModel and through a Repository class, I am trying to get an instance of a DB (in a separate abstract class that extends the RoomDatabase superclass). I call the ViewModel from the MainActivity class by the ViewModelProviders method. I get the following error:
Here is the whole stack trace of the exception:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.roomlistingapllicate, PID: 31766
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.roomlistingapllicate/com.example.roomlistingapllicate.MainActivity}: java.lang.RuntimeException: Cannot create an instance of class com.example.roomlistingapllicate.NOtesViewModel
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2572)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2654)
at android.app.ActivityThread.access$900(ActivityThread.java:175)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1488)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5728)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: java.lang.RuntimeException: Cannot create an instance of class com.example.roomlistingapllicate.NOtesViewModel
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:238)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:164)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:130)
at com.example.roomlistingapllicate.MainActivity.onCreate(MainActivity.java:19)
at android.app.Activity.performCreate(Activity.java:6309)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2519)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2654) 
at android.app.ActivityThread.access$900(ActivityThread.java:175) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1488) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:207) 
at android.app.ActivityThread.main(ActivityThread.java:5728) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:230)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:164) 
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:130) 
at com.example.roomlistingapllicate.MainActivity.onCreate(MainActivity.java:19) 
at android.app.Activity.performCreate(Activity.java:6309) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2519) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2654) 
at android.app.ActivityThread.access$900(ActivityThread.java:175) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1488) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:207) 
at android.app.ActivityThread.main(ActivityThread.java:5728) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
Caused by: java.lang.RuntimeException: cannot find implementation for com.example.roomlistingapllicate.NotesDatabase. NotesDatabase_Impl does not exist
at androidx.room.Room.getGeneratedImplementation(Room.java:94)
at androidx.room.RoomDatabase$Builder.build(RoomDatabase.java:851)
at com.example.roomlistingapllicate.NotesDatabase.getInstance(NotesDatabase.java:23)
at com.example.roomlistingapllicate.NoteRepository.<init>(NoteRepository.java:15)
at com.example.roomlistingapllicate.NOtesViewModel.<init>(NOtesViewModel.java:15)
at java.lang.reflect.Constructor.newInstance(Native Method) 
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:230) 
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:164) 
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:130) 
at com.example.roomlistingapllicate.MainActivity.onCreate(MainActivity.java:19) 
at android.app.Activity.performCreate(Activity.java:6309) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2519) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2654) 
at android.app.ActivityThread.access$900(ActivityThread.java:175) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1488) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:207) 
at android.app.ActivityThread.main(ActivityThread.java:5728) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
I am working on the AndroidX arch. Here are some parts of the code I think the issue hides in:
import androidx.appcompat.app.AppCompatActivity;
import androidx.lifecycle.ViewModelProviders;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
private NOtesViewModel nOtesViewModel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nOtesViewModel = ViewModelProviders.of(this).get(NOtesViewModel.class);
}
}
import android.app.Application;
import androidx.annotation.NonNull;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;
import java.util.List;
public class NOtesViewModel extends AndroidViewModel {
private NoteRepository noteRepository;
private LiveData<List<Note>> allNotes;
public NOtesViewModel(#NonNull Application application) {
super(application);
noteRepository = new NoteRepository(application);
allNotes = noteRepository.getAllNotes();
}
import android.app.Application;
import android.os.AsyncTask;
import androidx.lifecycle.LiveData;
import java.util.List;
public class NoteRepository {
private NoteDAO noteDAO;
private LiveData<List<Note>> allNotes;
public NoteRepository(Application application) {
NotesDatabase notesDatabase = NotesDatabase.getInstance(application.getApplicationContext());
noteDAO = notesDatabase.noteDAO();
allNotes = noteDAO.getAllNotes();
}
import android.content.Context;
import android.os.AsyncTask;
import androidx.annotation.NonNull;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;
import androidx.sqlite.db.SupportSQLiteDatabase;
#Database(entities = {Note.class}, version = 1)
public abstract class NotesDatabase extends RoomDatabase {
private static NotesDatabase instance;
public abstract NoteDAO noteDAO();
public static synchronized NotesDatabase getInstance(Context context) {
if (instance == null) {
instance = Room.databaseBuilder(context.getApplicationContext(), NotesDatabase.class,
"note_database").fallbackToDestructiveMigration()
.addCallback(roomCallback)
.build();
}
return instance;
}

The stacktrace says you're getting this error because Room can not find an implementation of your Notes Database abstract class.
Please make sure you have added the room annotation processor dependency in your app's build.gradle file.
annotationProcessor "androidx.room:room-compiler:$room_version"
Edit: If you are using Kotlin, use kapt instead of annotationProcessor, and make sure to add apply plugin: 'kotlin-kapt' at top of the app's build.gradle file.

Why can't Mockito find android.content.Context in android library unit test?

I can't figure out the correct setup that I need to let my unit tests run correctly inside my android library.
My application consists of a 4 modules: 1 application and 3 android libraries.
I want to run a unit test inside one of my libraries and I always get this error:
java.lang.IllegalStateException: Failed to transform class with name ch.leonardbutz.hellosunshine.core.controller.DataHandlerTest. Reason: cannot find android.content.Context
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:296)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:204)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass1(DeferSupportingClassLoader.java:89)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:79)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:161)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:48)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:108)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:71)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:36)
at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
Caused by: javassist.CannotCompileException: cannot find android.content.Context
at javassist.expr.NewExpr.replace(NewExpr.java:215)
at org.powermock.core.transformers.impl.AbstractMainMockTransformer$PowerMockExpressionEditor.edit(AbstractMainMockTransformer.java:500)
at javassist.expr.ExprEditor.loopBody(ExprEditor.java:212)
at javassist.expr.ExprEditor.doit(ExprEditor.java:91)
at javassist.CtClassType.instrument(CtClassType.java:1465)
at org.powermock.core.transformers.impl.ClassMockTransformer.transformMockClass(ClassMockTransformer.java:65)
at org.powermock.core.transformers.impl.AbstractMainMockTransformer.transform(AbstractMainMockTransformer.java:62)
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:277)
... 31 more
Caused by: javassist.NotFoundException: android.content.Context
at javassist.ClassPool.get(ClassPool.java:452)
at javassist.bytecode.Descriptor.toCtClass(Descriptor.java:592)
at javassist.bytecode.Descriptor.getParameterTypes(Descriptor.java:439)
at javassist.expr.NewExpr.replace(NewExpr.java:188)
... 38 more
I don't quite understand this, because in my opinion I have everything declared correctly in my dependencies...
gradle.build:
apply plugin: 'com.android.library'
android {
compileSdkVersion project.myCompileSdkVersion
defaultConfig {
minSdkVersion project.myMinSdkVersion
targetSdkVersion project.myTargetSdkVersion
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
lintOptions {
abortOnError false
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
testCompile 'org.powermock:powermock-api-mockito:1.7.3'
testCompile 'org.powermock:powermock-module-junit4:1.7.3'
implementation project(':hellosunshine-communication')
compileOnly project(':hellosunshine-model')
}
And my test class:
package ch.leonardbutz.hellosunshine.core.controller;
import android.content.Context;
import junit.framework.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import ch.leonardbutz.hellosunshine.core.communication.weather.OpenWeatherDataService;
import ch.leonardbutz.hellosunshine.core.data.source.cache.FileWeatherCachingService;
#RunWith(PowerMockRunner.class)
#PrepareForTest({DataHandler.class, FileWeatherCachingService.class, OpenWeatherDataService.class})
public class DataHandlerTest {
private DataHandler dataHandler;
#Mock
private Context contextMock;
#Mock
private FileWeatherCachingService fileWeatherCachingServiceMock;
#Mock
private OpenWeatherDataService openWeatherDataServiceMock;
#BeforeClass
public void setupSuite() throws Exception {
PowerMockito.whenNew(FileWeatherCachingService.class).withNoArguments().thenReturn(fileWeatherCachingServiceMock);
PowerMockito.whenNew(OpenWeatherDataService.class).withNoArguments().thenReturn(openWeatherDataServiceMock);
}
#Before
public void setupTest() {
dataHandler = new DataHandler(contextMock);
}
#Test
public void testLoadWeather_withCachedData() {
// TODO
Assert.assertEquals(true, true);
}
}
Any help would be really appreciated. The whole project can also be found here: https://github.com/ControlTheBit/hello-sunshine

Android Library JUnit Test with Robolectric: java.lang.InstantiationException

When trying to run a JUnit test on an Android Library project with Robolectric i get the following error:
java.lang.RuntimeException: java.lang.InstantiationException
at com.xtremelabs.robolectric.ApplicationResolver.newApplicationInstance(ApplicationResolver.java:56)
at com.xtremelabs.robolectric.ApplicationResolver.resolveApplication(ApplicationResolver.java:36)
at com.xtremelabs.robolectric.RobolectricTestRunner.createApplication(RobolectricTestRunner.java:246)
at com.xtremelabs.robolectric.RobolectricTestRunner.setupApplicationState(RobolectricTestRunner.java:233)
at com.xtremelabs.robolectric.RobolectricTestRunner.internalBeforeTest(RobolectricTestRunner.java:177)
at com.xtremelabs.robolectric.RobolectricTestRunner.methodBlock(RobolectricTestRunner.java:157)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.xtremelabs.robolectric.ApplicationResolver.newApplicationInstance(ApplicationResolver.java:54)
... 20 more
My first idea was that i made a mistake within the test, so i simplified the test run as much as possible:
import static org.junit.Assert.*;
import org.junit.Test;
import org.junit.runner.RunWith;
import com.xtremelabs.robolectric.RobolectricTestRunner;
#RunWith(RobolectricTestRunner.class)
public class CommonDataTest {
#Test
public void test(){
assertTrue(true);
}
}
but i still get the same error. I set up the Project as described here: http://robolectric.org/eclipse-quick-start/
The strange thing is that it worked with other Android Library Projects without any problems.
Any help would be appreciated! Thank you in advance!

it seemed that Robolectric was unable to create the Application from my library so i replaced the TestRunner:
import org.junit.runners.model.InitializationError;
import android.app.Application;
import com.xtremelabs.robolectric.RobolectricTestRunner;
public class MyTestRunner extends RobolectricTestRunner {
public MyTestRunner(Class<?> testClass)
throws InitializationError {
super(testClass);
}
#Override protected Application createApplication() {
return new Application() {
};
}
}
and used it instead of the RobolectricTestRunner:
#RunWith(MyTestRunner.class)
The tests are running properly now.