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# https://github.com/graphql-python/graphene/issues/356
from pytest import raises
import graphene
from graphene import relay
class SomeTypeOne(graphene.ObjectType):
pass
class SomeTypeTwo(graphene.ObjectType):
pass
class MyUnion(graphene.Union):
class Meta:
types = (SomeTypeOne, SomeTypeTwo)
def test_issue():
class Query(graphene.ObjectType):
things = relay.ConnectionField(MyUnion)
with raises(Exception) as exc_info:
graphene.Schema(query=Query)
assert str(exc_info.value) == (
"Query fields cannot be resolved."
" IterableConnectionField type has to be a subclass of Connection."
' Received "MyUnion".'
)
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