``` ... api = mock(MyRetrofitApiClient::cl...

# test

[tenprint]

...
    api = mock(MyRetrofitApiClient::class.java)
    ...

    @Test
    fun getProfileFromServer_Error() {
        `when`(api.getUser(USER_ID)).thenThrow(UnknownHostException()) <-- This throws a mockito error: "org.mockito.exceptions.base.MockitoException: Checked exception is invalid for this method!"

        val testObserver = TestObserver<ProfileStateModel>()

        api
            .getUser(USER_ID))
            .map { ProfileStateModel.Success(it) as ProfileStateModel }
            .onErrorReturn { ProfileStateModel.Error(it) }
            .subscribe(testObserver)

        testObserver ... assert some things
    }

I'm trying to write a test for a failed API call scenario, but I'm having trouble simulating the failure due to the above Mockito error. What's a better way to do this?