Adding gcmSenderId in tests setup

[corrado4eyes]

Tests for remote-config fail with the following

Firebase Remote Config is missing the required GCMSenderID property from the configured FirebaseApp and will not be able to function properly. Please fix this issue to ensure that Firebase is correctly configured.

Example test:

class FirebaseConfigTest {

    @BeforeTest
    fun initializeFirebase() {
        Firebase
            .takeIf { Firebase.apps(context).isEmpty() }
            ?.initialize(
                context,
                FirebaseOptions(
                    applicationId = "1:846484016111:ios:dd1f6688bad7af768c841a",
                    apiKey = "AIzaSyCK87dcMFhzCz_kJVs2cT2AVlqOTLuyWV0",
                    databaseUrl = "https://fir-kotlin-sdk.firebaseio.com",
                    storageBucket = "fir-kotlin-sdk.appspot.com",
                    projectId = "fir-kotlin-sdk"
                )
            )
    }

    @Test
    fun testFetch() = runTest {
        Firebase.config.fetch()
    }
}

When testFetch() is executed the test fails with the message above. I checked the other tests and it seems that none of them is passing gcmSenderId in FirebaseOptions. Is it possible to add it?