Unit test - No runnable methods in LoaderTestCase, ObaLoaderTestCase, and ObaTestCase

[barbeau]

Summary:

For the superclasses of the the unit tests, LoaderTestCase, ObaLoaderTestCase, and ObaTestCase, when running "All Tests" in Android Studio I get the below stack trace:

java.lang.Exception: No runnable methods
at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:191)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:128)
at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
at android.support.test.internal.runner.junit4.AndroidJUnit4ClassRunner.<init>(AndroidJUnit4ClassRunner.java:39)
at android.support.test.runner.AndroidJUnit4.<init>(AndroidJUnit4.java:49)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.support.test.internal.runner.junit4.AndroidAnnotatedBuilder.buildAndroidRunner(AndroidAnnotatedBuilder.java:71)
at android.support.test.internal.runner.junit4.AndroidAnnotatedBuilder.runnerForClass(AndroidAnnotatedBuilder.java:48)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at android.support.test.internal.runner.AndroidRunnerBuilder.runnerForClass(AndroidRunnerBuilder.java:153)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at android.support.test.internal.runner.TestLoader.doCreateRunner(TestLoader.java:73)
at android.support.test.internal.runner.TestLoader.getRunnersFor(TestLoader.java:104)
at android.support.test.internal.runner.TestRequestBuilder.build(TestRequestBuilder.java:789)
at android.support.test.runner.AndroidJUnitRunner.buildRequest(AndroidJUnitRunner.java:539)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:382)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2106)

I believe this is just a configuration issue - we need to tell AndroidJUnit4ClassRunner not to treat these classes as runnable unit tests

Steps to reproduce:

1. Right-click on the androidTest/java folder
2. Click "Run 'All Tests'"

Expected behavior:

All unit tests run should pass

Observed behavior:

LoaderTestCase, ObaLoaderTestCase, and ObaTestCase have an initialization error with java.lang.Exception: No runnable methods

Device and Android version:

Master branch as of 144d045, with Android Studio 3.1.2