I am working on upgrading my codebase to Gradle 2.2 and Android Studio 1.0. I am currently trying to get Robolectric 2.4 working, but I am experiencing a strange issue when I try and run Unit Tests. The issue occurs only after a gradle clean; running the test suite multiple times will produce passing tests (as expected). When I run the tests after a clean, I get the following error:
java.lang.ClassCastException: java.lang.NoClassDefFoundError cannot be cast to java.lang.RuntimeException
I have traced the error back to this call:
Activity activity = Robolectric.setupActivity(MainActivity.class);
I experience this error whether I use the Robolectric gradle plugin (org.robolectric:robolectric-gradle-plugin:0.14.0) or the JC and K Android unit test plugin (com.github.jcandksolutions.gradle:android-unit-test:2.1.1).
I found this issue referenced on the Robolectric Github, but it doesn't look like it has been addressed yet: https://github.com/robolectric/robolectric/issues/1385
This issue is also referenced in the android studio unit test plugin, under 'Trouble Shooting': https://github.com/evant/android-studio-unit-test-plugin
My current sample code is here: https://github.com/KioKrofovitch/robolectric-upgrade-test
I have been able to run the api-android-16 project on the Robolectric samples without seeing this issue, though api-android-19 and api-android-21 projects fail for other reasons. I cannot see what they are doing differently such that they do not get this failure. https://github.com/robolectric/robolectric-samples
Has anyone found a workaround to this? Running the tests twice is not a good workaround for CI tools like Jenkins or Travis.
EDIT: Embedding code samples
My top level build.gradle where I add the JC and K Unit test library:
buildscript {
repositories {
mavenCentral()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.0.0'
classpath 'com.github.jcandksolutions.gradle:android-unit-test:2.1.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
My project level build.gradle, where I add in robolectric:
apply plugin: 'com.android.application'
repositories {
mavenCentral()
}
android {
compileSdkVersion 21
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "com.example.robolectrictest"
minSdkVersion 15
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
sourceSets {
main {
jniLibs.srcDirs = ['libs']
}
androidTest {
setRoot('src/androidTest')
}
}
}
// Must be after Android plugin
apply plugin: 'android-unit-test'
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:21.0.3'
//androidTestCompile 'junit:junit:4.10'
//androidTestCompile 'org.robolectric:robolectric:2.4'
// Testing frameworks
testCompile 'junit:junit:4.10'
testCompile 'org.robolectric:robolectric:2.4'
}
My very basic Activity, everything has been left as the template creates it:
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
My dummy test, where I can't get to my assert due to the setupActivity() method error:
@Config(emulateSdk = 18)
@RunWith(RobolectricTestRunner.class)
public class ApplicationTest {
@org.junit.Test
public void testDummy() throws Exception {
Activity activity = Robolectric.setupActivity(MainActivity.class);
assertTrue(true);
}
}
EDIT #2: To run the tests I invoke the following commands from the top level directory of my project:
./gradlew clean
./gradlew test
I have also tried running the tests outside the gradle wrapper, and get the same results
gradle clean
gradle test