fix(test): minor fix to test case

Author: tglman

tests/test_ogm.py

@@ -144,7 +144,7 @@ def testGraph(self):
                       g.foods.query(name=food.name).what(expand(in_(Eats)))) \
                              .what(Animal.name).all())
 
-        for food_name, food_color in g.query(Food.name, Food.color):
+        for food_name, food_color in g.query(Food.name, Food.color).all():
             print(food_name, food_color) # 'pea green' # 'cheese yellow'
 
         # FIXME While it is nicer to use files, parser should be more