Using MockResponseMixin

[svsk417]

Hi!
I have two questions regarding mocking a response using the MockResponseMixin provided.

First question

I am using mockito as mocking framework and the analyzer tells me the following when using the suggested implementation of:

base class MockResponse<BodyType> extends Mock
    with MockResponseMixin<BodyType> {}

This class (or a class that this class inherits from) is marked as '@immutable', but one or more of its instance fields aren't final: Mock._givenName, Mock._givenHashCode, Mock._defaultRespons

This does not seem to be the intended usage then, I guess?

Second question

When I use it like:

      final mockDto =
          MockResponse<Dto>();
      when(mockVersionResponse.isSuccessful).thenReturn(false);

This fails with:

test/mocks_generator.dart 19:12                      MockResponse.isSuccessful
test/some_test.dart 203:32  main.<fn>.<fn>

type 'Null' is not a subtype of type 'bool'

What did I overlook? A hint would be much appreciated!
Thank you in advance!