android - Robotium testing: empty test suite -

can't make robotium work. used to, fails error:
running tests test running startedfinish empty test suite.

my test draft:

public class mainactivitytest extends activityinstrumentationtestcase2 <mainactivity> {  private solo solo;  public mainactivitytest() {     super(mainactivity.class); }  @override protected void setup() throws exception {     super.setup();     solo = new solo(getinstrumentation(), getactivity()); }  @override protected void teardown() throws exception {     super.teardown();     solo.finishopenedactivities(); }  @override protected void runtest() throws throwable {     super.runtest(); } 

}

build.gradle

    defaultconfig {     applicationid "my.app"     testinstrumentationrunner "android.test.instrumentationtestrunner" } 

androidmanifest.xml

<instrumentation android:name="android.test.instrumentationtestrunner" android:targetpackage="my.app"/> 

in edit configurations instrumentation runner have android.test.instrumentationtestrunner. where's problem?

which have figured out empty test , started test finished test run test unable call test method, have prefix mainactivity class method test mainactivity method. e.g

class mainactivity extends activity{ //class    public void calculatesomething(){}  }  class mainactivitytest extends activityinstrumentationtestcase2 <mainactivity>{ //class b - test class in case mainactivitytest     @testcalculate   public void testcalculatesomething(){         //do testing here   }  } 

dont forgot sequence of calling main activity functions same here in testclass.

for more info please check why android test runner reporting "empty test suite"?