How to run MockApplication of a new flavor in Android project?

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My app have two flavors. For sake of Espresso testing I created another flavor called mock in order to mock server response and create something that I would like to test against with.

So build.gradle file of my app project looks like this:

android {

    useLibrary 'org.apache.http.legacy'

    sourceSets {
        main {
            res.srcDirs = [
                    'src/main/res', 'src/main/res-flags', ...
            ]
        }

        test {
            res.srcDirs = ['src/test/resources']
        }
    }

    defaultConfig {
        applicationId "com.my.package_1"
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }

    productFlavors {
        mock {
            applicationId "com.mock.package"
            ...
        }

        flavor_1 {
            applicationId "com.my.package_1"
            ...
        }

        flavor_2 {
            applicationId "com.my.package_2"
            ...
        }
    }

    buildTypes {
        debug {
            // Setup default urls
            buildConfigField "String", "API_URL_BASE", "\"https://www.example_1.com\""

            // Enabling multidex support.
            multiDexEnabled true

            dexOptions {
                incremental true
                javaMaxHeapSize "4g"
            }
        }

        release {
            // Enable when testing proguard
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
            signingConfig signingConfigs.release

            // Setup default urls
            buildConfigField "String", "API_URL_BASE", "\"https://www.example_2.com\""
        }

        applicationVariants.all { variant ->
            variant.outputs.each { v ->
                def f = v.outputFile
                def sha = 'git rev-parse --short HEAD'.execute().text.trim()
                def fname = f.name.replace(".apk", "-${defaultConfig.versionName}-${defaultConfig.versionCode}-${sha}.apk")
                v.outputFile = new File(f.parent, fname)
            }
        }
    }

    // Remove mockRelease as it's not needed.
    android.variantFilter { variant ->
        if(variant.buildType.name.equals('release')
                && variant.getFlavors().get(0).name.equals('mock')) {
            variant.setIgnore(true);
        }
    }

    // Always show the result of every unit test, even if it passes.
    testOptions.unitTests.all {
        testLogging {
            events 'passed', 'skipped', 'failed', 'standardOut', 'standardError'
        }
    }
}

I have created a Mock folder, it has its own manifest.xml file and it looks like this:
enter image description here

My Manifest file:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools">

    <permission
        android:name="com.mock.passenger.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="com.mock.passenger.permission.MAPS_RECEIVE"/>

    <!-- Settings for GCM -->
    <permission
        android:name="com.mock.passenger.gcm.permission.C2D_MESSAGE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="com.mock.passenger.gcm.permission.C2D_MESSAGE"/>

    <application
        android:name="com.mock.passenger.MockApplication"
        tools:replace="android:name">
        
        ...

    </application>

</manifest>

Before running the app, I set my build variant on mockDebug. I run the app and application gets installed on emulator. I confirm this build variant has installed because I have changed the name of it. However, it seems my MockApplication never gets called although I have defined it in Manifest file. The reason is I don’t see those things that I have logged.

public class MockApplication extends MyApplication
{
    public static final String TAG = MockApplication.class.getName();

    @Override
    public void onCreate()
    {
        Logger.debug(TAG, "*********************");
        Logger.debug(TAG, "** MockApplication **");
        Logger.debug(TAG, "*********************");

        super.onCreate();
    }

....
}

I’m not sure if something in my gradle file has missed so any idea would be appreciated, thanks.