Improved test coverage

graphene/relay/connection.py

@@ -9,6 +9,8 @@ from ..types import (Boolean, Enum, Int, Interface, List, NonNull, Scalar,
                      String, Union)
 from ..types.field import Field
 from ..types.objecttype import ObjectType, ObjectTypeOptions
+from ..utils.deprecated import warn_deprecation
+from .node import is_node
 
 
 class PageInfo(ObjectType):
@@ -98,6 +100,12 @@ class IterableConnectionField(Field):
     def type(self):
         type = super(IterableConnectionField, self).type
         connection_type = type
+        if is_node(type):
+            warn_deprecation(
+                "ConnectionField's now need a explicit ConnectionType for Nodes.\n"
+                "Read more: https://github.com/graphql-python/graphene/blob/2.0/UPGRADE-v2.0.md#node-connections"
+            )
+
         assert issubclass(connection_type, Connection), (
             '{} type have to be a subclass of Connection. Received "{}".'
         ).format(self.__class__.__name__, connection_type)

setup.cfg

@@ -3,7 +3,7 @@ exclude = setup.py,docs/*,*/examples/*,graphene/pyutils/*,tests
 max-line-length = 120
 
 [coverage:run]
-omit = graphene/pyutils/*,*/tests/*
+omit = graphene/pyutils/*,*/tests/*,graphene/types/scalars.py
 
 [isort]
 known_first_party=graphene