Potential Issues with ActivityScenario

[mark...@willowtreeapps.com]

ActivityScenario.launch(IndexActivity.class);

1/5 times when using ActivityScenario to launch my activity, I am getting this error as described in this SO post.

https://stackoverflow.com/questions/53598321/androidx-test-activityscenario-java-lang-assertionerror-activity-never-becomes

10:54:42 V/InstrumentationResultParser: java.lang.AssertionError: Activity never becomes requested state "[RESUMED]" (last lifecycle transition = "STOPPED")
10:54:42 V/InstrumentationResultParser: at androidx.test.core.app.ActivityScenario.waitForActivityToBecomeAnyOf(ActivityScenario.java:228)
10:54:42 V/InstrumentationResultParser: at androidx.test.core.app.ActivityScenario.moveToState(ActivityScenario.java:368)
10:54:42 V/InstrumentationResultParser: at com.myapplication.android.test.HomeTest.launchActivity(HomeTest.java:30)
10:54:42 V/InstrumentationResultParser: at java.lang.reflect.Method.invoke(Native Method)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
10:54:42 V/InstrumentationResultParser: at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
10:54:42 V/InstrumentationResultParser: at androidx.test.internal.runner.junit4.statement.RunBefores.evaluate(RunBefores.java:76)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
10:54:42 V/InstrumentationResultParser: at androidx.test.ext.junit.runners.AndroidJUnit4.run(AndroidJUnit4.java:104)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.Suite.runChild(Suite.java:128)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.Suite.runChild(Suite.java:27)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
10:54:42 V/InstrumentationResultParser: at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
10:54:42 V/InstrumentationResultParser: at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
10:54:42 V/InstrumentationResultParser: at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
10:54:42 V/InstrumentationResultParser: at androidx.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
10:54:42 V/InstrumentationResultParser: at androidx.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:388)
10:54:42 V/InstrumentationResultParser: at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2075)

Has anyone else had flakiness in the state of their activities when using ActivityScenario?

[Brett Chabot]

Thanks for the report. Would you mind filing an issue here https://github.com/android/android-test/issues ? 

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[mark...@willowtreeapps.com]

I have updated a bit more on the SO post: https://stackoverflow.com/questions/53598321/androidx-test-activityscenario-java-lang-assertionerror-activity-never-becomes/53638398#53638398

The TL;DR is that there is a big limitation of scenario.waitForActivityToBecomeAnyOf(State.RESUMED, State.DESTROYED);  within launch(Intent startActivityIntent) method of ActivityScenario.

It would be awesome if we could optionally specify what states we want to wait for before launching. I can file an issue on this as well. 

Thanks Brett.

-Mark Han

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[mark...@willowtreeapps.com]

Issue posted here: https://github.com/android/android-test/issues/143