competitive-programming-rs 22.0.0

use crate::utils::scanner::IO;
use std::fs;
use std::fs::File;
use std::io::Read;
use std::str;

pub(crate) struct Tester {
    input: Vec<(String, Vec<u8>)>,
    output: Vec<(String, Vec<u8>)>,
}

impl Tester {
    pub(crate) fn new(input_directory: &str, output_directory: &str) -> Tester {
        let input = read_from_directory(input_directory);
        let output = read_from_directory(output_directory);
        Tester { input, output }
    }

    pub(crate) fn test_solution<F>(self, solution: F)
    where
        F: Fn(&mut IO<&[u8], &mut Vec<u8>>),
    {
        for ((input_label, input), (output_label, output)) in
            self.input.into_iter().zip(self.output)
        {
            eprintln!("Testing {} {}", input_label, output_label);
            let mut writer = vec![];
            {
                let mut sc = IO::new(&input[..], &mut writer);
                solution(&mut sc);
            }
            assert_eq!(writer, output);
        }
    }
    pub(crate) fn test_solution_with<F1, F2>(self, solution: F1, assertion: F2)
    where
        F1: Fn(&mut IO<&[u8], &mut Vec<u8>>),
        F2: Fn(&mut IO<&[u8], &mut Vec<u8>>, &mut IO<&[u8], &mut Vec<u8>>),
    {
        for ((input_label, input), (output_label, output)) in
            self.input.into_iter().zip(self.output)
        {
            eprintln!("Testing {} {}", input_label, output_label);
            let mut writer = vec![];
            {
                let mut sc = IO::new(&input[..], &mut writer);
                solution(&mut sc);
            }

            let mut actual_writer = vec![];
            let mut expected_writer = vec![];
            let mut actual = IO::new(&writer[..], &mut actual_writer);
            let mut expected = IO::new(&output[..], &mut expected_writer);
            assertion(&mut expected, &mut actual);
        }
    }
}

fn read_file(filepath: &str) -> Vec<u8> {
    let mut file = File::open(filepath).unwrap();
    let mut buf = Vec::new();
    file.read_to_end(&mut buf).unwrap();
    buf
}

fn read_from_directory(directory_path: &str) -> Vec<(String, Vec<u8>)> {
    let mut filenames: Vec<String> = fs::read_dir(directory_path)
        .unwrap()
        .map(|result| result.unwrap().path().display().to_string())
        .collect();
    filenames.sort();
    filenames
        .into_iter()
        .map(|file| {
            let data = read_file(&file);
            (file, data)
        })
        .collect()
}