running androidTest folder empty test throws errnoexception

Question

i have an empty android UI test for my MainActivity clas code below.

@RunWith(AndroidJUnit4.class)

public class MainActivityTest {

@Rule public ActivityTestRule<MainActivity> mActivityRule = new ActivityTestRule<>( MainActivity.class); @Test public void test() { } }

its throwing an exception and I dont know why.

the log message is

"Test failed to run to completion. Reason: 'Instrumentation run failed due to 'android.system.ErrnoException''. Check device logcat for details Test running failed: Instrumentation run failed due to 'android.system.ErrnoException'"

I found this in the docs https://developer.android.com/reference/android/system/ErrnoException.html

but It doesn't really explain much. tried googling also but with no luck. found a few old answers on here but none using the testing support library and none of the questions had this particular type of exception. I was wondering can anyone help me out ? This may be a bit of an edge case. Thanks.

Theresa · Accepted Answer · 2016-12-05 03:46:02Z

Please check your AndroidManifest.xml; Make sure you have the defined permission below:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

I received the same exception, and searched on Google. I finally added this permission to resolve the problem.

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