rusty-numbers/tests/fractions.rs

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#![cfg_attr(tarpaulin, skip)]
use rusty_numbers::frac;
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use rusty_numbers::rational::Frac;
#[test]
fn mul_test() {
let frac1 = frac!(1 / 3u8);
let frac2 = frac!(2u8 / 3);
let expected = frac!(2u8 / 9);
assert_eq!(frac1 * frac2, expected);
assert_eq!(frac!(0), frac!(0) * frac!(5 / 8));
}
#[test]
fn div_test() {
assert_eq!(frac!(1), frac!(1 / 3) / frac!(1 / 3));
assert_eq!(frac!(1 / 9), frac!(1 / 3) / frac!(3));
}
#[test]
fn add_test() {
assert_eq!(frac!(5 / 8), frac!(5 / 8) + frac!(0));
assert_eq!(frac!(5 / 6), frac!(1 / 3) + frac!(1 / 2), "1/3 + 1/2");
assert_eq!(frac!(1 / 3), frac!(2 / 3) + -frac!(1 / 3), "2/3 + -1/3");
}
#[test]
fn sub_test() {
assert_eq!(frac!(5 / 8), frac!(5 / 8) - frac!(0));
assert_eq!(frac!(1 / 6), frac!(1 / 2) - frac!(1 / 3), "1/2 - 1/3");
}
#[test]
fn cmp_test() {
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assert!(frac!(1 / 2) <= frac!(1 / 2));
assert!(frac!(0) < frac!(1));
assert!(-frac!(5 / 3) < frac!(1 / 10_000));
assert!(frac!(1 / 10_000) > -frac!(10));
assert!(frac!(1 / 3) < frac!(1 / 2));
assert_eq!(frac!(1 / 2), frac!(3 / 6));
}
#[test]
fn negative_fractions() {
assert_eq!(-frac!(1 / 3), -frac!(2 / 3) + frac!(1 / 3), "-2/3 + 1/3");
assert_eq!(frac!(1), frac!(1 / 3) - -frac!(2 / 3), "1/3 - -2/3");
assert_eq!(-frac!(1), -frac!(2 / 3) - frac!(1 / 3), "-2/3 - +1/3");
assert_eq!(-frac!(1), -frac!(2 / 3) + -frac!(1 / 3), "-2/3 + -1/3");
}
#[test]
fn negative_mul_div() {
assert_eq!(-frac!(1 / 12), -frac!(1 / 3) * frac!(1 / 4));
assert_eq!(-frac!(1 / 12), frac!(1 / 3) * -frac!(1 / 4));
assert_eq!(frac!(1 / 12), -frac!(1 / 3) * -frac!(1 / 4));
}
#[test]
#[should_panic(expected = "Fraction can not have a zero denominator")]
fn zero_denom() {
frac!(1 / 0);
}
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#[test]
fn fraction_reducing() {
assert_eq!(frac!(1u8/2), Frac::new_unreduced(48u8, 96u8).reduce());
}
#[test]
fn op_assign() {
// Addition
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let mut quart = frac!(1 / 4);
quart += frac!(1 / 4);
assert_eq!(frac!(1 / 2), quart);
// Subtraction
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let mut half = frac!(1 / 2);
half -= frac!(1 / 4);
assert_eq!(frac!(1 / 4), half);
// Multiplication
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let mut half = frac!(1 / 2);
half *= frac!(1 / 2);
assert_eq!(frac!(1 / 4), half);
// Division
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let mut quart = frac!(1 / 4);
quart /= frac!(4);
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assert_eq!(frac!(1 / 16), quart);
}