Update tests for Marshmallow 3

Fixes #3

app/widget/controller_test.py

@@ -35,7 +35,7 @@ class TestWidgetResource:
                         make_widget(456, name="Test Widget 2"),
                     ]
                 )
-                .data
+                
             )
             for r in results:
                 assert r in expected
@@ -51,7 +51,7 @@ class TestWidgetResource:
             expected = (
                 WidgetSchema()
                 .dump(Widget(name=payload["name"], purpose=payload["purpose"]))
-                .data
+                
             )
             assert result == expected
 
@@ -91,6 +91,6 @@ class TestWidgetIdResource:
             expected = (
                 WidgetSchema()
                 .dump(Widget(widget_id=123, name="New Widget", purpose="New purpose"))
-                .data
+                
             )
             assert result == expected

app/widget/schema_test.py

@@ -17,7 +17,7 @@ def test_WidgetSchema_create(schema: WidgetSchema):
 def test_WidgetSchema_works(schema: WidgetSchema):
     params: WidgetInterface = schema.load(
         {"widgetId": "123", "name": "Test widget", "purpose": "Test purpose"}
-    ).data
+    )
     widget = Widget(**params)
 
     assert widget.widget_id == 123