As far as I know this is a feature that currently works fine:
e.g. from the test system:
```
{"entities":{"Q2":{"pageid":5,"ns":120,"title":"Item:Q2","lastrevid":7,"modified":"2021-08-11T08:10:30Z","type":"item","id":"Q2","labels":{"en":{"language":"en","value":"foo cat"}},"descriptions":{},"aliases":{},"claims":{"P1":[{"mainsnak":{"snaktype":"value","property":"P1","hash":"874d19e6a8080831f530365565a57dc9dd3ba463","datavalue":{"value":"cat","type":"string"},"datatype":"string"},"type":"statement","id":"Q2$158446eb-4a66-c356-6a79-3cd1e66bf622","rank":"normal"}]},"sitelinks":{}}}}
```
however right now these pages cannot subsequently be re-rendered (which is to be handled in T285293).
Within this ticket, we want to write some test cases to ensure that the ability to save statements with local properties continues.
**BDD** Scenario: On an entity page in a Wikibase with Federated Properties enabled
`GIVEN` I am adding a statement to a local entity containing a local property
`WHEN` I click Save
`THEN` I can view valid entity JSON from Special:EntityData/Q1.json