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!(
21 scientific_exponent(i32::min_value(), 0, 0),
22 i32::min_value()
23 );
24 assert_eq!(
25 scientific_exponent(i32::min_value(), 0, 5),
26 i32::min_value()
27 );
28
29 // Overflow
30 assert_eq!(
31 scientific_exponent(i32::max_value(), 0, 0),
32 i32::max_value() - 1
33 );
34 assert_eq!(
35 scientific_exponent(i32::max_value(), 5, 0),
36 i32::max_value()
37 );
38 }
39
40 #[test]
mantissa_exponent_test()41 fn mantissa_exponent_test() {
42 assert_eq!(mantissa_exponent(10, 5, 0), 5);
43 assert_eq!(mantissa_exponent(0, 5, 0), -5);
44 assert_eq!(
45 mantissa_exponent(i32::max_value(), 5, 0),
46 i32::max_value() - 5
47 );
48 assert_eq!(mantissa_exponent(i32::max_value(), 0, 5), i32::max_value());
49 assert_eq!(mantissa_exponent(i32::min_value(), 5, 0), i32::min_value());
50 assert_eq!(
51 mantissa_exponent(i32::min_value(), 0, 5),
52 i32::min_value() + 5
53 );
54 }
55