In Administering the API Gateway, "Update & Test Staging Environment" button is mentioned in several sections. The button and the test feature is removed on 2.7.

Some sections, like Mapping rules and Policies, that existed in the APIcast configuration page on 2.6 are extracted under the Integration menu. So the configuration flow has changed. The old configuration flow remains in the document.

Note: The button still exists on 3scale SaaS.