added tests for meta assignment

cleaned up _meta assignment slightly

graphene/relay/connection.py

@@ -51,8 +51,7 @@ class Connection(ObjectType):
 
     @classmethod
     def __init_subclass_with_meta__(cls, node=None, name=None, _meta=None, **options):
-        if not _meta:
-            _meta = ConnectionOptions(cls)
+        _meta = _meta or ConnectionOptions(cls)
         assert node, "You have to provide a node in {}.Meta".format(cls.__name__)
         assert isinstance(node, NonNull) or issubclass(
             node, (Scalar, Enum, ObjectType, Interface, Union, NonNull)

graphene/relay/tests/test_connection.py

@@ -1,7 +1,7 @@
 import pytest
 
 from ...types import Argument, Field, Int, List, NonNull, ObjectType, Schema, String
-from ..connection import Connection, ConnectionField, PageInfo
+from ..connection import Connection, ConnectionField, PageInfo, ConnectionOptions
 from ..node import Node
 
 
@@ -51,6 +51,25 @@ def test_connection_inherit_abstracttype():
     assert list(fields.keys()) == ["page_info", "edges", "extra"]
 
 
+def test_connection_meta_assignment():
+    meta = ConnectionOptions(Connection)
+
+    class BaseConnection(object):
+        extra = String()
+
+    class MyObjectConnection(BaseConnection, Connection):
+        class Meta:
+            node = MyObject
+
+        @classmethod
+        def __init_subclass_with_meta__(cls, node=None, name=None, **options):
+            return super(MyObjectConnection, cls).__init_subclass_with_meta__(
+                _meta=meta, node=node, name=name,  **options
+            )
+
+    assert id(MyObjectConnection._meta) == id(meta)
+
+
 def test_connection_name():
     custom_name = "MyObjectCustomNameConnection"