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bigint: add failing tests for bigint carry

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Asherah Connor 2021-03-22 23:18:50 +11:00 committed by Veikka Tuominen
parent 56c0a66ce3
commit 1db6018140
1 changed files with 26 additions and 0 deletions
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26
lib/std/math/big/int_test.zig
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@ -1562,3 +1562,29 @@ test "big.int pow" {
try testing.expectEqual(@as(i32, 1), try a.to(i32));
}
}
test "bigint regression test for 1 limb overflow with alias" {
// Note these happen to be two consecutive Fibonacci sequence numbers, the
// first two whose sum exceeds 2**64.
var a = try Managed.initSet(testing.allocator, 7540113804746346429);
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 12200160415121876738);
defer b.deinit();
try a.add(a.toConst(), b.toConst());
try testing.expect(a.toConst().orderAgainstScalar(19740274219868223167) == .eq);
}
test "bigint regression test for something else with alias" {
// Note these happen to be two consecutive Fibonacci sequence numbers, the
// second of which is the first such number to exceed 2**192.
var a = try Managed.initSet(testing.allocator, 5611500259351924431073312796924978741056961814867751431689);
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 9079598147510263717870894449029933369491131786514446266146);
defer b.deinit();
try a.add(a.toConst(), b.toConst());
try testing.expect(a.toConst().orderAgainstScalar(14691098406862188148944207245954912110548093601382197697835) == .eq);
}