android {
    defaultConfig {
        ...

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        testInstrumentationRunnerArguments clearPackageData: 'true'
    }
    testOptions {
        execution 'ANDROID_TEST_ORCHESTRATOR'
    }
}

dependencies {
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestUtil 'com.android.support.test:orchestrator:1.0.2'
}

task installTestUtils() {
    doFirst {
        // Resolve and install all files associated with androidTestUtil configuration, which will be both - test services and the orchestrator APKs
        configurations.androidTestUtil.resolvedConfiguration.files.forEach { filePath ->
            println "Installing ${filePath} ..."
            exec {
                workingDir projectDir
                commandLine 'adb', 'install', '-r', filePath
            }
        }
    }
}