#[cfg(test)]
mod tests {
    use std::cmp::{max, min};
    use std::str::FromStr;
    use std::time::{Instant, Duration};
    use rust_decimal::Decimal;
    use rust_decimal::prelude::{FromPrimitive, ToPrimitive};
    use rust_decimal_macros::dec;

    #[test]
    // 计算十秒内能执行多少次decimal计算
    fn test_decimal_subtraction_performance() {
        // decimal使用的参考文档：https://docs.rs/rust_decimal/latest/rust_decimal/
        // 在AMD Ryzen 7 5800X 8-Core Processor下，Decimal平均每秒可以计算1200w次（28位小数）~1600w次（1位小数）
        let mut count = 0u64;
        let point_3 = dec!(0.3323289834012382184823981293);
        let point_2 = dec!(0.2518364912329136932183926421);
        let num = point_3 - point_2;
        let seconds = 10;

        let start = Instant::now();
        while start.elapsed() < Duration::from_secs(seconds) {
            let _ = point_3 - point_2;
            count += 1;
        }

        println!("Performed {} decimal subtractions in one second(avg), result is {:?}.", count / seconds, num.to_f64().unwrap());
    }

    #[test]
    fn test_decimal_equals() {
        let a = dec!(0.123234213);
        let b = dec!(0.123234213);
        println!("{} == {} is {}", a, b, a == b);
        println!("{}.eq({}) is {}", a, b, a.eq(&b));
    }

    #[test]
    fn test_decimal_min_and_max() {
        let a = dec!(0.123234213);
        let b = dec!(0.823004213);
        println!("max({}, {})={}", a, b, max(a, b));
        println!("min({}, {})={}", a, b, min(a, b));
    }

    #[test]
    fn test_decimal_from() {
        let a = dec!(1e-6);
        let b = Decimal::from_f64(f64::from_str("1e-6").unwrap()).unwrap();

        println!("a={}", a);
        println!("b={:?}", b);
    }
}