UnexpectedExpressMocker: Mock out additional socket attribute
UnexpectedExpressMocker: Mock out additional socket attribute

In node 18 requires that the socket passed into IncomingMessage is an
actual NodeStream.

The actual method used to check that is available here: https://github.com/nodejs/node/blob/c3aa86d6784af77121e5e98e75c6dc12e5bb39ec/lib/internal/streams/utils.js#L46-L56

unexpectedjs/unexpected-express