Another issue we're seeing after update to Apollo ...

# apollo-kotlin

[John O'Reilly]

Another issue we're seeing after update to Apollo 4.0 is that some tests are failing with....any particular known changes needed for this now?

When building fallback types, you must specify '__typename'
java.lang.IllegalStateException: When building fallback types, you must specify '__typename'
	at com.apollographql.apollo.api.FakeResolverKt.buildFieldOfNonNullType(fakeResolver.kt:198)

[bod]

I think it's related to this? If you pass an interface you need to set the __typename - or you can pass a concrete type, which will set it for you.

[John O'Reilly]

Thanks, looks like that was the issue