use malachite_base::num::arithmetic::traits::NegAssign;
use malachite_base::test_util::generators::signed_gen;
use malachite_nz::integer::Integer;
use malachite_nz::platform::{SignedDoubleLimb, SignedLimb};
use malachite_nz::test_util::generators::{integer_gen, natural_gen};
use num::BigInt;
use std::str::FromStr;
#[test]
fn test_neg() {
let test = |s, out| {
let u = Integer::from_str(s).unwrap();
let neg = -u.clone();
assert!(neg.is_valid());
assert_eq!(neg.to_string(), out);
let neg = -&u;
assert!(neg.is_valid());
assert_eq!(neg.to_string(), out);
assert_eq!((-BigInt::from_str(s).unwrap()).to_string(), out);
assert_eq!((-rug::Integer::from_str(s).unwrap()).to_string(), out);
let mut x = u;
x.neg_assign();
assert!(x.is_valid());
assert_eq!(x.to_string(), out);
};
test("0", "0");
test("123", "-123");
test("-123", "123");
test("1000000000000", "-1000000000000");
test("-1000000000000", "1000000000000");
test("-2147483648", "2147483648");
test("2147483648", "-2147483648");
}
#[test]
fn neg_properties() {
integer_gen().test_properties(|x| {
let negative = -x.clone();
assert!(negative.is_valid());
assert!(negative.is_valid());
let negative_alt = -&x;
assert!(negative_alt.is_valid());
assert_eq!(negative_alt, negative);
assert_eq!(Integer::from(&-BigInt::from(&x)), negative);
assert_eq!(Integer::from(&-rug::Integer::from(&x)), negative);
assert_eq!(negative == x, x == 0);
assert_eq!(-&negative, x);
assert_eq!(x + negative, 0);
});
signed_gen::<SignedLimb>().test_properties(|x| {
assert_eq!(Integer::from(-SignedDoubleLimb::from(x)), -Integer::from(x));
});
natural_gen().test_properties(|x| {
assert_eq!(-&x, -Integer::from(x));
});
}