From d15d8066d0ffe18242c256ff7592ed1481e9d6a2 Mon Sep 17 00:00:00 2001
From: William Baker <bbrk24@gmail.com>
Date: Sat, 2 Dec 2023 21:05:05 -0500
Subject: [PATCH] add addition tests

---
 tests/unit/overflow.hh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tests/unit/overflow.hh b/tests/unit/overflow.hh
index f795674..d9a0fdc 100644
--- a/tests/unit/overflow.hh
+++ b/tests/unit/overflow.hh
@@ -26,6 +26,17 @@ testgroup (overflow) {
         auto result = first.multiply_with_overflow(second);
         test_assert(!result.first && result.second == INT24_C(0xe00000));
     }
+    , testcase (add_not_overflow) {
+        int24_t n = INT24_C(0x700000);
+        auto result = n.add_with_overflow(n);
+        test_assert(!result.first && result.second == INT24_C(0xe00000));
+        result = result.second.add_with_overflow(result.second);
+        test_assert(!result.first && result.second == INT24_C(-0x400000));
+    }
+    , testcase (add_overflow) {
+        auto result = INT24_MIN.add_with_overflow(INT24_MIN);
+        test_assert(result.first);
+    }
     , testcase (inc_max) {
         int24_t x = INT24_MAX;
         ++x;