1 // Adapted from https://github.com/Alexhuszagh/rust-lexical.
2
3 use crate::lexical::exponent::*;
4
5 #[test]
scientific_exponent_test()6 fn scientific_exponent_test() {
7 // 0 digits in the integer
8 assert_eq!(scientific_exponent(0, 0, 5), -6);
9 assert_eq!(scientific_exponent(10, 0, 5), 4);
10 assert_eq!(scientific_exponent(-10, 0, 5), -16);
11
12 // >0 digits in the integer
13 assert_eq!(scientific_exponent(0, 1, 5), 0);
14 assert_eq!(scientific_exponent(0, 2, 5), 1);
15 assert_eq!(scientific_exponent(0, 2, 20), 1);
16 assert_eq!(scientific_exponent(10, 2, 20), 11);
17 assert_eq!(scientific_exponent(-10, 2, 20), -9);
18
19 // Underflow
20 assert_eq!(scientific_exponent(i32::MIN, 0, 0), i32::MIN);
21 assert_eq!(scientific_exponent(i32::MIN, 0, 5), i32::MIN);
22
23 // Overflow
24 assert_eq!(scientific_exponent(i32::MAX, 0, 0), i32::MAX - 1);
25 assert_eq!(scientific_exponent(i32::MAX, 5, 0), i32::MAX);
26 }
27
28 #[test]
mantissa_exponent_test()29 fn mantissa_exponent_test() {
30 assert_eq!(mantissa_exponent(10, 5, 0), 5);
31 assert_eq!(mantissa_exponent(0, 5, 0), -5);
32 assert_eq!(mantissa_exponent(i32::MAX, 5, 0), i32::MAX - 5);
33 assert_eq!(mantissa_exponent(i32::MAX, 0, 5), i32::MAX);
34 assert_eq!(mantissa_exponent(i32::MIN, 5, 0), i32::MIN);
35 assert_eq!(mantissa_exponent(i32::MIN, 0, 5), i32::MIN + 5);
36 }
37