I'm trying to create some simple tests for my Android app but I'm running into issues with getting the tests to even run. I keep getting a NoClassDefFound error while I'm trying to run the test, however I can't seem to figure out what the cause of it is. I'd appreciate it if I could get a fresh pair of eyes to look at this.
EDIT: Here is a picture of the structure:
Here's the error that I keep getting:
junit.framework.AssertionFailedError: Exception in constructor: testScanResultNotNull (java.lang.NoClassDefFoundError: nl.hanze.myhealth.ScanResultActivity
at nl.hanze.myhealth.CameraTest.<init>(CameraTest.java:14)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
at junit.runner.BaseTestRunner.getTest(BaseTestRunner.java:118)
at android.test.AndroidTestRunner.getTest(AndroidTestRunner.java:149)
at android.test.AndroidTestRunner.setTestClassName(AndroidTestRunner.java:57)
at android.test.suitebuilder.TestSuiteBuilder.addTestClassByName(TestSuiteBuilder.java:80)
at android.test.InstrumentationTestRunner.parseTestClass(InstrumentationTestRunner.java:443)
at android.test.InstrumentationTestRunner.parseTestClasses(InstrumentationTestRunner.java:424)
at android.test.InstrumentationTestRunner.onCreate(InstrumentationTestRunner.java:370)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4435)
at android.app.ActivityThread.access$1300(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)
CameraTest
package nl.hanze.myhealth;
import android.test.ActivityInstrumentationTestCase2;
import android.test.suitebuilder.annotation.SmallTest;
public class CameraTest extends ActivityInstrumentationTestCase2<ScanResultActivity> {
ScanResultActivity mActivity;
public CameraTest(){
super(ScanResultActivity.class);
}
@Override
protected void setUp()throws Exception{
super.setUp();
mActivity = getActivity();
}
@SmallTest
public void testScanResultNotNull(){
boolean test = mActivity.generateScanResult();
assertNotNull(test);
}
@Override
protected void tearDown() throws Exception{
super.tearDown();
}
}
ScanResultActivity
package nl.hanze.myhealth;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import java.util.Random;
public class ScanResultActivity extends Activity {
Random rand = new Random();
public ScanResultActivity(){
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan_result);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.scan_result, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected boolean generateScanResult(){
boolean positive_scanresult;
int max = 10;
int min = 1;
int randomNum = rand.nextInt((max - min) + 1) + min;
if(randomNum >= 6){
positive_scanresult = true;
}else{
positive_scanresult = false;
}
return positive_scanresult;
}
}
I started getting this error suddenly in Android Studio running tests as packages (JUnit/Robolectric3/Gradle) and had no idea why. I was able to run the test files independently just fine, but I got the NoClassDefFoundError exception when running all tests together inside of a package.
Turns out the classpath during runtime wasnt loading classes correctly. The issue could not be reproduced on another machine.
To fix it, I deleted my project .idea folder and .iml files, then reimported the whole Gradle project to Android Studio. Then it worked!
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