def METHOD_NAME(subscriber_builder: Callable[[Mapping], Subscriber]):
    subscribers = [
        subscriber_builder(
            {
                NAMESPACE_REF: "some_namespace",
                TARGET_FILE_PATH: "some_saas",
                DESIRED_REF: "new",
                DESIRED_TARGET_HASHES: [
                    ConfigHash(channel="a", target_config_hash="b", parent_saas="c"),
                    ConfigHash(channel="e", target_config_hash="f", parent_saas="g"),
                ],
            }
        ),
        subscriber_builder(
            {
                NAMESPACE_REF: "other_namespace",
                TARGET_FILE_PATH: "other_saas",
                DESIRED_REF: "new",
                DESIRED_TARGET_HASHES: [
                    ConfigHash(channel="a", target_config_hash="b", parent_saas="c"),
                    ConfigHash(channel="e", target_config_hash="f", parent_saas="g"),
                ],
            }
        ),
    ]
    assert (
        len(Subscriber.combined_content_hash(subscribers=subscribers))
        == CONTENT_HASH_LENGTH
    )