#[cfg(test)]
#[allow(dead_code)]

use std::error::Error;
use std::fs::File;
use std::io::prelude::*;
use std::path::Path;

pub fn read_json_file(filename: &str) -> String {
    // Create a path to the desired file
    let path = Path::new(filename);
    let display = path.display();

    let mut file = match File::open(&path) {
        Err(why) => panic!("couldn't open {}: {}", display, Error::description(&why)),
        Ok(file) => file,
    };

    // Read the file contents into a string, returns `io::Result<usize>`
    let mut s = String::new();
    match file.read_to_string(&mut s) {
        Err(why) => panic!("couldn't read {}: {}", display, Error::description(&why)),
        Ok(_) => {} // print!("{} contains:\n{}", display, s),
    };

    s
}