AndroidTestRunner.kt

class AndroidTestRunner : AndroidJUnitRunner() {

    override fun newApplication(cl: ClassLoader, className: String, context: Context): Application {
        // The DexOpener library allows to make Kotlin classes, properties and functions 
        // open during tests in order to mock then with Mockito. 
        DexOpener.install(this)
        return super.newApplication(cl, AndroidTestApplication::class.java.name, context)
    }
}