Allow subclassing while still protecting the registry

Author: dfee

graphene_sqlalchemy/registry.py

@@ -6,10 +6,11 @@ def __init__(self):
         self._registry_composites = {}
 
     def register(self, cls):
-        from .types import SQLAlchemyObjectType
-        assert issubclass(
-            cls, SQLAlchemyObjectType), 'Only SQLAlchemyObjectType can be registered, received "{}"'.format(
-            cls.__name__)
+        from .types import SQLAlchemyObjectType, SQLAlchemyObjectTypeMeta
+        assert issubclass(type(cls), SQLAlchemyObjectTypeMeta), (
+            'Only classes of type SQLAlchemyObjectTypeMeta can be registered, ',
+            'received "{}"'
+        ).format(cls.__name__)
         assert cls._meta.registry == self, 'Registry for a Model have to match.'
         # assert self.get_type_for_model(cls._meta.model) in [None, cls], (
         #     'SQLAlchemy model "{}" already associated with '

setup.cfg

@@ -7,3 +7,20 @@ omit = */tests/*
 
 [isort]
 known_first_party=graphene,graphene_sqlalchemy
+
+[tool:pytest]
+testpaths = graphene_sqlalchemy/
+addopts =
+    -s
+    ; --cov graphene-sqlalchemy
+norecursedirs =
+    __pycache__
+    *.egg-info
+    .cache
+    .git
+    .tox
+    appdir
+    docs
+filterwarnings =
+    error
+    ignore::DeprecationWarning