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: coveralls.rs
    path of file: ./repos/tarpaulin/src/report
    
    the code of the file until where you have to start completion: use crate::config::Config;
use crate::errors::RunError;
use crate::traces::{CoverageStat, TraceMap};
use coveralls_api::*;
use std::collections::HashMap;
use
    
    fn get_rel_path_coveralls_friendly_on_windows() {
        let config = Config::default();
        let file = PathBuf::from("src\\report\\coveralls.rs");
        let rel_path = get_rel_path(&config, &&file);

        assert_eq!(rel_path, PathBuf::from("src/report/coveralls.rs"));
    }