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mul overflow multipart test

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This commit is contained in:
Nikolay Volf 2016-02-26 16:19:55 +03:00
parent 3858a2011f
commit 023c623650
1 changed files with 27 additions and 0 deletions
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27
util/src/uint.rs
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@ -1560,7 +1560,34 @@ mod tests {
assert_eq!(U256([1, 0, 0, 0]), result);
}
#[test]
fn u256_multi_muls_overflow() {
let (_, overflow) = U256([1, 0, 0, 0]).overflowing_mul(U256([0, 0, 0, 0]));
assert!(!overflow);
let (_, overflow) = U256([1, 0, 0, 0]).overflowing_mul(U256([0, 0, 0, ::std::u64::MAX]));
assert!(!overflow);
let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 0, 0, ::std::u64::MAX]));
assert!(!overflow);
let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 1, 0, 0]));
assert!(!overflow);
let (_, overflow) = U256([0, 1, 0, ::std::u64::MAX]).overflowing_mul(U256([0, 1, 0, ::std::u64::MAX]));
assert!(overflow);
let (_, overflow) = U256([0, ::std::u64::MAX, 0, 0]).overflowing_mul(U256([0, ::std::u64::MAX, 0, 0]));
assert!(!overflow);
let (_, overflow) = U256([1, 0, 0, 0]).overflowing_mul(U256([10, 0, 0, 0]));
assert!(!overflow);
let (_, overflow) = U256([2, 0, 0, 0]).overflowing_mul(U256([0, 0, 0, ::std::u64::MAX / 2]));
assert!(!overflow);
let (_, overflow) = U256([0, 0, 8, 0]).overflowing_mul(U256([0, 0, 7, 0]));
assert!(overflow);
}
}