How to run android uiautomator tests without source code

I have some tests written using UiAutomator and I build and run them just fine using

gradlew cC (or gradlew connectedCheck).

However, I want to make my test project available without providing the source code.

Running

gradlew test

or

gradlew check

doesn't seem to do anything significant (event after a cleanTest).

Can anyone help me? It has to be possible... I just want to run the tests without having to provide their source code...

Following I give you some information that you may find useful. Btw, NameOfThePackage is the path to the package like com.stuff.xpto

My project structure is

project
    build.gradle
    app
        build.gradle
        src
            androidTest
                java
                    NameOfThePackage
                        MainFile.java  //contains the tests
            main
                res/
                AndroidManifest.xml

My AndroidManifest file is

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://ift.tt/nIICcg"
    package="NameOfThePackage.test" >
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
    </application>
</manifest>

My project/build.gradle is

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

My project/app/build.graddle is

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
    }
}
apply plugin: 'com.android.application'

repositories {
    jcenter()
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "NameOfThePackage"
        minSdkVersion 21
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_6
        targetCompatibility JavaVersion.VERSION_1_6
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug{
            debuggable true
        }
    }
    packagingOptions {
        exclude 'LICENSE.txt'
    }

    sourceSets{
        androidTest.setRoot('src/androidTest')
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.0.0'
    androidTestCompile 'com.android.support.test:testing-support-lib:0.1'
    androidTestCompile 'com.android.support:support-annotations:23.1.0'

}

And Finally my MainFile.java is:

@RunWith(AndroidJUnit4.class)
public class MainFile{
    @Before
    public void setUp(){
        //get instrumentation and stuff like that
    }

    @Test
    public mainTest(){
        //the test content
    }

    @After
    tearDown(){
        //clear stuff
    }