// Open a read-write realm to create the file
var config = new RealmConfiguration(Guid.NewGuid().ToString());
var realm = Realm.GetInstance(config);
realm.Dispose();

config.IsReadOnly = true;

// Open the same realm as readonly
realm = Realm.GetInstance(config);
Realm frozenRealm = null;

// Freeze the readonly realm
Assert.DoesNotThrow(() => frozenRealm = realm.Freeze());
frozenRealm.Dispose();