Update to testing code per requested changes

Update the mock response for username and also updated comments for okta IDP on test-fence-config

tests/test-fence-config.yaml

@@ -93,6 +93,8 @@ OPENID_CONNECT:
     client_id: ''
     client_secret: ''
     redirect_url: '{{BASE_URL}}/login/cognito/login/'
+  # For information on configuring an Okta tenant as an OIDC IdP refer to Okta documentation at:
+  # https://developer.okta.com/docs/reference/api/oidc/#2-okta-as-the-identity-platform-for-your-app-or-api  
   okta:
       discovery_url: ''
       client_id: ''

tests/test_audit_service.py

@@ -339,6 +339,9 @@ def test_login_log_login_endpoint(
     elif idp == "shib":
         headers["persistent_id"] = username
         idp_name = "itrust"
+    elif idp == "okta":
+        mocked_get_user_id = MagicMock()
+        get_user_id_value = {"okta": username}
     elif idp == "fence":
         mocked_fetch_access_token = MagicMock(return_value={"id_token": jwt_string})
         patch(