Update tests for Marshmallow 3

Fixes #3

app/other_api/whatsit/controller_test.py

@@ -37,7 +37,7 @@ class TestWhatsitResource:
                         make_whatsit(456, name="Test Whatsit 2"),
                     ]
                 )
-                .data
+                
             )
             for r in results:
                 assert r in expected
@@ -53,7 +53,7 @@ class TestWhatsitResource:
             expected = (
                 WhatsitSchema()
                 .dump(Whatsit(name=payload["name"], purpose=payload["purpose"]))
-                .data
+                
             )
             assert result == expected
 
@@ -94,6 +94,6 @@ class TestWhatsitIdResource:
                 .dump(
                     Whatsit(whatsit_id=123, name="New Whatsit", purpose="New purpose")
                 )
-                .data
+                
             )
             assert result == expected

app/other_api/whatsit/schema_test.py

@@ -17,7 +17,7 @@ def test_WhatsitSchema_create(schema: WhatsitSchema):
 def test_WhatsitSchema_works(schema: WhatsitSchema):
     params: WhatsitInterface = schema.load(
         {"whatsitId": "123", "name": "Test whatsit", "purpose": "Test purpose"}
-    ).data
+    )
     whatsit = Whatsit(**params)
 
     assert whatsit.whatsit_id == 123