From b6472204e58d84047101d67cf602446203126d3a Mon Sep 17 00:00:00 2001
From: Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
Date: Sat, 6 Mar 2021 23:09:56 +0100
Subject: [PATCH] AK+Tests: Also test Checked<> with unsigned

As expected, Checked<unsigned> works as intended. However, we didn't have a
test for that, so I added one.

See also 90c070cb1d90d77ba461017e609b9f8ee6326de1.
---
 AK/Tests/TestChecked.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/AK/Tests/TestChecked.cpp b/AK/Tests/TestChecked.cpp
index 85abb9e530..3c28dddf36 100644
--- a/AK/Tests/TestChecked.cpp
+++ b/AK/Tests/TestChecked.cpp
@@ -118,6 +118,27 @@ TEST_CASE(detects_signed_overflow)
     EXPECT((Checked<i64>(-0x4000000000000000) - Checked<i64>(0x4000000000000001)).has_overflow());
 }
 
+TEST_CASE(detects_unsigned_overflow)
+{
+    EXPECT(!(Checked<u32>(0x40000000) + Checked<u32>(0x3fffffff)).has_overflow());
+    EXPECT(!(Checked<u32>(0x40000000) + Checked<u32>(0x40000000)).has_overflow());
+    EXPECT(!(Checked<u32>(0xf0000000) + Checked<u32>(0x0fffffff)).has_overflow());
+    EXPECT((Checked<u32>(0xf0000000) + Checked<u32>(0x10000000)).has_overflow());
+
+    EXPECT(!(Checked<u32>(0x40000000) - Checked<u32>(0x3fffffff)).has_overflow());
+    EXPECT(!(Checked<u32>(0x40000000) - Checked<u32>(0x40000000)).has_overflow());
+    EXPECT((Checked<u32>(0x40000000) - Checked<u32>(0x40000001)).has_overflow());
+
+    EXPECT(!(Checked<u64>(0x4000000000000000) + Checked<u64>(0x3fffffffffffffff)).has_overflow());
+    EXPECT(!(Checked<u64>(0x4000000000000000) + Checked<u64>(0x4000000000000000)).has_overflow());
+    EXPECT(!(Checked<u64>(0xf000000000000000) + Checked<u64>(0x0fffffffffffffff)).has_overflow());
+    EXPECT((Checked<u64>(0xf000000000000000) + Checked<u64>(0x1000000000000000)).has_overflow());
+
+    EXPECT(!(Checked<u64>(0x4000000000000000) - Checked<u64>(0x3fffffffffffffff)).has_overflow());
+    EXPECT(!(Checked<u64>(0x4000000000000000) - Checked<u64>(0x4000000000000000)).has_overflow());
+    EXPECT((Checked<u64>(0x4000000000000000) - Checked<u64>(0x4000000000000001)).has_overflow());
+}
+
 TEST_CASE(should_constexpr_default_construct)
 {
     constexpr Checked<int> checked_value {};