Android testing in Android Studio using Robolectric issue

Issue

First of all I would like to declare my frustration for the lack of proper testing infrastructure in Android... or maybe I am retarded, I don't know...
I eventually managed to setup android-test-plugin and I wrote a couple of tests for an activity that includes in its layout a CustomMapFragment which is a class I wrote that extends SupportMapFragment.
All my tests that try to get an instance of this activity using:

activity = Robolectric.buildActivity(MyActivity.class).create().get();

fail with:

java.lang.NoClassDefFoundError: com/google/android/gms/maps/GoogleMap$OnInfoWindowClickListener

at activity's setContentView.

The activity's xml is the following:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context=".MyActivity">

    <fragment
            android:id="@+id/customMapFragment"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            class="com.myproject.CustomMapFragment"/>
</RelativeLayout>

Is there a workaround/solution for this? Any help would be appreciated.

Solution

I have temporary solution. The problem seems to be that the android-test-plugin in unable to read an aar file. My solution is to add a dependency to the jar file instead only to testCompile, like this

testCompile files('YOUR_ANDROID_SDK_FOLDER/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar')

Like this I'm able to run a simple test, for example creating a LatLng and checking if it's not null, without errors. Hope it helps.

Edit

A better solution thanks to SuperJugy on github is to apply the fix in this commit https://github.com/SuperJugy/gradle-android-test-plugin/commit/d5b7836cf7278dc9d0fe765b635de60c33911d72

Answered By - alex