Adding support for enum model AllValues

Fixes #368

ChangeLog:
  - Updating test mysql version as it no longer exists.
  - Add a simple validation test

.circleci/config.yml

@@ -16,7 +16,7 @@ jobs:
           POSTGRES_DB: jetdb
           PGPORT: 50901
 
-      - image: circleci/mysql:8.0.27
+      - image: circleci/mysql:8.0
         command: [ --default-authentication-plugin=mysql_native_password ]
         environment:
           MYSQL_ROOT_PASSWORD: jet
@@ -163,4 +163,4 @@ workflows:
   version: 2
   build_and_test:
     jobs:
-      - build_and_tests
+      - build_and_tests