def METHOD_NAME(  # type: ignore
    base_repo_review_manager: colrev.review_manager.ReviewManager,
) -> None:
    """Test the search add_source"""
    search_operation = base_repo_review_manager.get_search_operation()
    add_source = colrev.settings.SearchSource(
        endpoint="colrev.crossref",
        filename=(
            base_repo_review_manager.path / Path("data/search/crossref_search.bib")
        ),
        search_type=colrev.settings.SearchType.DB,
        search_parameters={"query": "test"},
        comment="",
    )
    package_manager = search_operation.review_manager.get_package_manager()
    search_source = package_manager.load_packages(
        package_type=colrev.env.package_manager.PackageEndpointType.search_source,
        selected_packages=[{"endpoint": add_source.endpoint}],
        operation=search_operation,
        instantiate_objects=False,
    )
    s_obj = search_source[add_source.endpoint]
    query = "issn=1234-5678"
    s_obj.add_endpoint(search_operation, query)  # type: ignore
    search_operation.review_manager.settings.sources.pop()