Android Studio robotium apk testing(black box)

I'm trying to run black box(i need to test apk from different project) UI test using Robotium in Android Studio. I created simple app with only 1 activity containing single TextView with text "Hello World!". So in my test i'll check if text "Hello World!" is present in activity. Package of this app is com.example.apptotest.

For beginning i created integrated test inside this project to check if i use Robotium tests correct. So, i created test class inside androidTest directory. Here is code:

public class SimpleTest extends
        ActivityInstrumentationTestCase2<MainActivity> {

    private Solo solo;

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

    public void setUp() throws Exception {
        solo = new Solo(getInstrumentation(), getActivity());
    }

    @Override
    public void tearDown() throws Exception {
        solo.finishOpenedActivities();
    }

    public void testCorrectActivity() throws Exception {
        Assert.assertTrue(solo.searchText("Hello World!"));
    }

}

After executing test i got Tests ran to completion. 1 test passed. Great! Test is working perfect.

Then i tried to run the same test from another project. I created new project with package com.example.blackboxapptest and added this test class with some changes for targeting to my tested app package:

public class SimpleTest extends
        ActivityInstrumentationTestCase2 {

    private static final String LAUNCHER_ACTIVITY_FULL_CLASSNAME = "com.example.apptotest.MainActivity";
    private static Class launcherActivityClass;
    static {

        try {
            launcherActivityClass = Class
                    .forName(LAUNCHER_ACTIVITY_FULL_CLASSNAME);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }

    public SimpleTest() throws ClassNotFoundException {
        super(launcherActivityClass);
    }

    private Solo solo;

    public void setUp() throws Exception {
        solo = new Solo(getInstrumentation(), getActivity());
    }

    @Override
    public void tearDown() throws Exception {
        solo.finishOpenedActivities();
    }

    public void testCorrectActivity() throws Exception {
        Assert.assertTrue(solo.searchText("Hello World!"));
    }

}

But after running this test i got Test running failed: Instrumentation run failed due to 'java.lang.ClassNotFoundException'

After that i added some additional fields to build.gradle:

testApplicationId "com.example.apptotest"
testInstrumentationRunner "android.test.InstrumentationTestRunner"

into defaultConfig. After that i got the same exception. Only one thing changed - when i added testApplicationId running test remove tested app from device and write itself to that package.

Then i checked adb log during installing test case which i wrote inside the same AppToTest project:

adb push D:\ASProjects\AppToTest\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.example.apptotest

adb shell pm install -r "/data/local/tmp/com.example.apptotest"


adb push D:\ASProjects\AppToTest\app\build\outputs\apk\app-debug-androidTest-unaligned.apk /data/local/tmp/com.example.apptotest.test

adb shell pm install -r "/data/local/tmp/com.example.apptotest.test"

AndroidTest apk installed with package com.example.apptotest.test. So i tried to change testApplicationId inside my BlackBoxAppTest to com.example.apptotest.test. I got the same exception, but AppToTest wasn't rewrited.

Here is adb log:

adb push D:\ASProjects\BlackBoxAppTest\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.example.blackboxapptest

adb shell pm install -r "/data/local/tmp/com.example.blackboxapptest"


adb push D:\ASProjects\BlackBoxAppTest\app\build\outputs\apk\app-debug-androidTest-unaligned.apk /data/local/tmp/com.example.apptotest.test

adb shell pm install -r "/data/local/tmp/com.example.apptotest.test"

So as i understood i have incorrectly specify the target apk for test.

Also i checked these similar questions: first, second, third, fourth but answers didn't help me.

Can anybody tell me how to specify app for black box testing?