exponent.rs - mozsearch

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// Adapted from https://github.com/Alexhuszagh/rust-lexical.

use crate::lexical::exponent::*;

#[test]

fn scientific_exponent_test() {

    // 0 digits in the integer

    assert_eq!(scientific_exponent(0, 0, 5), -6);

    assert_eq!(scientific_exponent(10, 0, 5), 4);

    assert_eq!(scientific_exponent(-10, 0, 5), -16);

    // >0 digits in the integer

    assert_eq!(scientific_exponent(0, 1, 5), 0);

    assert_eq!(scientific_exponent(0, 2, 5), 1);

    assert_eq!(scientific_exponent(0, 2, 20), 1);

    assert_eq!(scientific_exponent(10, 2, 20), 11);

    assert_eq!(scientific_exponent(-10, 2, 20), -9);

    // Underflow

    assert_eq!(scientific_exponent(i32::MIN, 0, 0), i32::MIN);

    assert_eq!(scientific_exponent(i32::MIN, 0, 5), i32::MIN);

    // Overflow

    assert_eq!(scientific_exponent(i32::MAX, 0, 0), i32::MAX - 1);

    assert_eq!(scientific_exponent(i32::MAX, 5, 0), i32::MAX);

#[test]

fn mantissa_exponent_test() {

    assert_eq!(mantissa_exponent(10, 5, 0), 5);

    assert_eq!(mantissa_exponent(0, 5, 0), -5);

    assert_eq!(mantissa_exponent(i32::MAX, 5, 0), i32::MAX - 5);

    assert_eq!(mantissa_exponent(i32::MAX, 0, 5), i32::MAX);

    assert_eq!(mantissa_exponent(i32::MIN, 5, 0), i32::MIN);

    assert_eq!(mantissa_exponent(i32::MIN, 0, 5), i32::MIN + 5);