Add a test for an unsupported type (Tuple), and test it coerces back to String.

Author: flipbit03

Diff for: graphene_sqlalchemy/tests/models.py

@@ -3,7 +3,7 @@
 import datetime
 import enum
 from decimal import Decimal
-from typing import List
+from typing import List, Tuple
 
 from sqlalchemy import (Column, Date, Enum, ForeignKey, Integer, String, Table,
                         func, select)
@@ -198,3 +198,9 @@ def hybrid_prop_first_shopping_cart_item(self) -> ShoppingCartItem:
     @hybrid_property
     def hybrid_prop_shopping_cart_item_list(self) -> List[ShoppingCartItem]:
         return [ShoppingCartItem(id=1), ShoppingCartItem(id=2)]
+
+    # Unsupported Type
+
+    @hybrid_property
+    def hybrid_prop_unsupported_type_tuple(self) -> Tuple[str, str]:
+        return "this will actually", "be a string"

Diff for: graphene_sqlalchemy/tests/test_converter.py

@@ -417,7 +417,8 @@ class Meta:
         "hybrid_prop_nested_list_int": List(List(Int)),
         "hybrid_prop_deeply_nested_list_int": List(List(List(Int))),
         "hybrid_prop_first_shopping_cart_item": ShoppingCartItemType,
-        "hybrid_prop_shopping_cart_item_list": List(ShoppingCartItemType)
+        "hybrid_prop_shopping_cart_item_list": List(ShoppingCartItemType),
+        "hybrid_prop_unsupported_type_tuple": String,
     }
 
     assert sorted(list(ShoppingCartType._meta.fields.keys())) == sorted([