public boolean checkEditText(int number) {
       return number > 0 ? true : false;
    }

public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {

    public MainActivityTest() {
        super(MainActivity.class);
    }


    public void testCheckNumber() {
        MainActivity activity = getActivity();

        boolean action = activity.checkEditText(0);
        Assert.assertTrue(action);
    }


}

Assert.assertTrue(false);