| // 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_value(), 0, 0), |
| i32::min_value() |
| ); |
| assert_eq!( |
| scientific_exponent(i32::min_value(), 0, 5), |
| i32::min_value() |
| ); |
| |
| // Overflow |
| assert_eq!( |
| scientific_exponent(i32::max_value(), 0, 0), |
| i32::max_value() - 1 |
| ); |
| assert_eq!( |
| scientific_exponent(i32::max_value(), 5, 0), |
| i32::max_value() |
| ); |
| } |
| |
| #[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_value(), 5, 0), |
| i32::max_value() - 5 |
| ); |
| assert_eq!(mantissa_exponent(i32::max_value(), 0, 5), i32::max_value()); |
| assert_eq!(mantissa_exponent(i32::min_value(), 5, 0), i32::min_value()); |
| assert_eq!( |
| mantissa_exponent(i32::min_value(), 0, 5), |
| i32::min_value() + 5 |
| ); |
| } |
