55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
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// Adapted from https://github.com/Alexhuszagh/rust-lexical.
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use crate::lexical::exponent::*;
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#[test]
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fn scientific_exponent_test() {
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// 0 digits in the integer
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assert_eq!(scientific_exponent(0, 0, 5), -6);
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assert_eq!(scientific_exponent(10, 0, 5), 4);
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assert_eq!(scientific_exponent(-10, 0, 5), -16);
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// >0 digits in the integer
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assert_eq!(scientific_exponent(0, 1, 5), 0);
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assert_eq!(scientific_exponent(0, 2, 5), 1);
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assert_eq!(scientific_exponent(0, 2, 20), 1);
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assert_eq!(scientific_exponent(10, 2, 20), 11);
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assert_eq!(scientific_exponent(-10, 2, 20), -9);
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// Underflow
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assert_eq!(
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scientific_exponent(i32::min_value(), 0, 0),
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i32::min_value()
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);
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assert_eq!(
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scientific_exponent(i32::min_value(), 0, 5),
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i32::min_value()
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);
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// Overflow
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assert_eq!(
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scientific_exponent(i32::max_value(), 0, 0),
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i32::max_value() - 1
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);
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assert_eq!(
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scientific_exponent(i32::max_value(), 5, 0),
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i32::max_value()
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);
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}
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#[test]
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fn mantissa_exponent_test() {
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assert_eq!(mantissa_exponent(10, 5, 0), 5);
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assert_eq!(mantissa_exponent(0, 5, 0), -5);
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assert_eq!(
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mantissa_exponent(i32::max_value(), 5, 0),
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i32::max_value() - 5
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);
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assert_eq!(mantissa_exponent(i32::max_value(), 0, 5), i32::max_value());
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assert_eq!(mantissa_exponent(i32::min_value(), 5, 0), i32::min_value());
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assert_eq!(
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mantissa_exponent(i32::min_value(), 0, 5),
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i32::min_value() + 5
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);
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}
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