def METHOD_NAME(local_engine_empty):
    # Test that the handlers in old config files (that referred to functions) still load
    # as classes (the default overrides them in this case and emits a warning).
    assert (
        _load_source("postgres_fdw", "splitgraph.hooks.mount_handlers.mount_postgres")
        == PostgreSQLDataSource
    )
    assert (
        _load_source("socrata", "splitgraph.ingestion.socrata.mount.mount_socrata")
        == SocrataDataSource
    )