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: sorter.rs
    path of file: ./repos/dozer/dozer-ingestion/postgres/src/schema
    
    the code of the file until where you have to start completion: use std::collections::HashMap;

use dozer_inges
    
    fn test_tables_sort_with_single_column() {
        let postgres_table = generate_postgres_table();
        let mut mapped_tables = HashMap::new();
        mapped_tables.insert(
            ("public".to_string(), "sort_test".to_string()),
            postgres_table,
        );

        let columns_order = vec!["third field".to_string()];
        let expected_table_order = &[ListOrFilterColumns {
            name: "sort_test".to_string(),
            schema: Some("public".to_string()),
            columns: Some(columns_order.clone()),
        }];

        let result = sort_schemas(expected_table_order, &mapped_tables).unwrap();
        assert_eq!(
            &result.first().unwrap().1.fields().first().unwrap().name,
            columns_order.first().unwrap()
        );
        assert_eq!(result.first().unwrap().1.fields().len(), 1);
    }