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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_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
);
}
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