ClasspathSuite runner fails on Android

[mbolotov]

I've encountered a problem when running a test by ClasspathSuite runner on Android platform:

import org.junit.extensions.cpsuite.ClasspathSuite;
import org.junit.runner.RunWith;

@RunWith(ClasspathSuite.class)
public class AllTabletTests {
}

The problem seems to be caused by Android specific value for "java.class.path" property: it's always '.'
See https://developer.android.com/reference/java/lang/System.html

So it fails with the following exception:

java.lang.NullPointerException: Attempt to get length of null array
at org.junit.extensions.cpsuite.RecursiveFilenameIterator.getInnerIterators(RecursiveFilenameIterator.java:46)
at org.junit.extensions.cpsuite.RecursiveFilenameIterator.(RecursiveFilenameIterator.java:36)
at org.junit.extensions.cpsuite.RecursiveFilenameIterator.(RecursiveFilenameIterator.java:29)
at org.junit.extensions.cpsuite.ClasspathClassesFinder.gatherClassesInRoot(ClasspathClassesFinder.java:65)
at org.junit.extensions.cpsuite.ClasspathClassesFinder.findClassesInRoots(ClasspathClassesFinder.java:50)
at org.junit.extensions.cpsuite.ClasspathClassesFinder.findClassesInClasspath(ClasspathClassesFinder.java:44)
at org.junit.extensions.cpsuite.ClasspathClassesFinder.find(ClasspathClassesFinder.java:33)
at org.junit.extensions.cpsuite.ClasspathSuite.getSortedTestclasses(ClasspathSuite.java:127)
at org.junit.extensions.cpsuite.ClasspathSuite.(ClasspathSuite.java:117)
at org.junit.extensions.cpsuite.ClasspathSuite.(ClasspathSuite.java:110)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:430)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:107)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
at android.support.test.internal.runner.junit4.AndroidAnnotatedBuilder.runnerForClass(AndroidAnnotatedBuilder.java:77)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runner.Computer.getRunner(Computer.java:40)
at org.junit.runner.Computer$1.runnerForClass(Computer.java:31)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.runners.model.RunnerBuilder.runners(RunnerBuilder.java:101)
at org.junit.runners.model.RunnerBuilder.runners(RunnerBuilder.java:87)
at org.junit.runners.Suite.(Suite.java:81)
at org.junit.runner.Computer.getSuite(Computer.java:28)
at android.support.test.internal.runner.TestRequestBuilder.classes(TestRequestBuilder.java:789)
at android.support.test.internal.runner.TestRequestBuilder.build(TestRequestBuilder.java:753)
at android.support.test.runner.AndroidJUnitRunner.buildRequest(AndroidJUnitRunner.java:354)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:260)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1932)

[timtheguy]

I've also experienced this when casually trying to use this package in Android - did you ever find a solution?

[mbolotov]

As far as I remember - we've ending up with an external runner that select and run the test set.

[timtheguy]

Thank you for the response - if you happen to recall the name of the runner, do let me know! Cheers

[mbolotov]

It's our locally developed runner, we didn't open source it. By 'external' I mean external to the junit system.