You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/tantivy/src/space_usage
    
    the code of the file until where you have to start completion: //! Representations fo
    
    fn test_empty() {
        let schema = Schema::builder().build();
        let index = Index::create_in_ram(schema);
        let reader = index.reader().unwrap();
        let searcher = reader.searcher();
        let searcher_space_usage = searcher.space_usage().unwrap();
        assert_eq!(searcher_space_usage.total(), 0u64);
    }