chs/examples/perft_test.rs

use chs::chess::perft::run_perft;
use chs::constants::*;

#[derive(Default)]
struct TestRunner {
    passed: usize,
    failed: usize,
}

impl TestRunner {
    fn run_test<F: Fn() -> bool>(&mut self, f: F) {
        let result = f();
        if result {
            self.passed += 1;
        } else {
            self.failed += 1;
        }
    }

    fn summarise(&self) {
        println!(
            "Ran {total} tests: {passed} passed, {failed} failed",
            total = self.passed + self.failed,
            passed = self.passed,
            failed = self.failed
        );
    }
}

fn main() {
    let mut runner = TestRunner::default();
    let mut perft = |fen: &str, depth: u64, expected_positions: u64| {
        runner.run_test(|| run_perft(fen, depth, expected_positions))
    };

    // Start position
    println!("Start position");
    perft(START_FEN, 0, 1);
    perft(START_FEN, 1, 20);
    perft(START_FEN, 2, 400);
    perft(START_FEN, 3, 8_902);
    perft(START_FEN, 4, 197_281);

    // Other test positions (https://www.chessprogramming.org/Perft_Results)

    // Position 2
    println!("Position 2");
    perft(POSITION_2, 1, 48);
    perft(POSITION_2, 2, 2_039);
    perft(POSITION_2, 3, 97_862);
    perft(POSITION_2, 4, 4_085_603);

    // Position 3
    println!("Position 3");
    perft(POSITION_3, 1, 14);
    perft(POSITION_3, 2, 191);
    perft(POSITION_3, 3, 2_812);
    perft(POSITION_3, 4, 43_238);
    perft(POSITION_3, 5, 674_624);
    perft(POSITION_3, 6, 11_030_083);

    // Position 4
    println!("Position 4");
    perft(POSITION_4, 1, 6);
    perft(POSITION_4, 2, 264);
    perft(POSITION_4, 3, 9_467);
    perft(POSITION_4, 4, 422_333);
    perft(POSITION_4, 5, 15_833_292);

    // Position 5
    println!("Position 5");
    perft(POSITION_5, 1, 44);
    perft(POSITION_5, 2, 1_486);
    perft(POSITION_5, 3, 62_379);
    perft(POSITION_5, 4, 2_103_487);

    // Position 6
    println!("Position 6");
    perft(POSITION_6, 1, 46);
    perft(POSITION_6, 2, 2_079);
    perft(POSITION_6, 3, 89_890);
    perft(POSITION_6, 4, 3_894_594);

    runner.summarise();
}