Migrating from SourceAsset to AssetSpec but there is no 'io_manager_def'

[GinaStavropoulou]

I am mocking an asset like this:

@pytest.fixture(scope="session")
def mock_asset(value):
    class MockIOManager(IOManager):
        def load_input(self, context):
            return value

        def handle_output(self, context, obj): 
            raise NotImplementedError()

    return SourceAsset(
        key=AssetKey(["group", "my_asset"]),
        io_manager_def=MockIOManager(),
    )

How can I use AssetSpec instead, when there is no 'io_manager_def' parameter?

[sryza]

Thanks for your patience on this one @GinaStavropoulou . I added an answer over here: #20611 (reply in thread).