Please can you remove the expectation from this line. The expectation is in the line above - this doesn't say anything.

It would be good to add a line that tests that some aspect of the firewall has been updated here as all this tests at the moment is that the method `update` calls `update_configuration` on Core::EdgeGateway. It's an integration test so it would be good to retrieve something from the actual firewall to confirm it has updated it.

If not, please change the title of the test.