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: "old",
                DESIRED_TARGET_HASHES: [
                    ConfigHash(channel="h", target_config_hash="i", parent_saas="j"),
                    ConfigHash(channel="e", target_config_hash="f", parent_saas="g"),
                ],
            }
        ),
    ]
    hashes = set()
    for _ in range(3):
        hashes.add(Subscriber.combined_content_hash(subscribers=subscribers))
    assert len(hashes) == 1