Test latlng in Firestore

I've been trying to test the GeoPoint object from Firestore, here's the code that I have:

request.resource.data.latLng is latlng;

and here's the portion of my test:

await firebase.assertSucceeds(userLocationRef.set({
            "name": "Some name",
            "locationString": "Some location",
            "objectID": "objectID",
            "phoneNumber": "Some phone number",
            "latLng": {
                "latitude": 9.82,
                "longitude": -82.877
            }
        }))

With this code my test doesn't pass, I there a way to test a GeoPoint from Firestore?