EventResponse cannot be constructed during tests

[lorenzo-bc]

I'm writing a local implementation of the Sift client and I'm adding integration tests. My (simplified) interface is

interface SiftPPService {
    fun createOrder(event: SiftPPCreateOrderEvent): EventResponse
}

And this interface has both a local and a remote implementation.
In the Local implementation I have to construct a com.siftscience.EventResponse object but this has a protected constructor so cannot be done. This is required in order to test scenario like 'what happens if the API returns a very specific fraud score or a specific error code'

Is there another way to build a EventResponse in a test without performing a remote call to the Sift API?
Note that EventResponseBody can be constructed but EventResponse not.