feat: Add endpoint testing + testing resources

#2 (closed)

spec/openapi.yaml

@@ -109,7 +109,9 @@ components:
              type: string
              description: the URL for the homepage of this working group
       WorkingGroupParticipationAgreement:
-         type: object
+         type: 
+            - object
+            - 'null'
          properties:
             document_id:
                $ref: '#/components/schemas/ObjectID'