From 22fc0b43372082999828787d2a3baae4388ffaf8 Mon Sep 17 00:00:00 2001
From: Lawrence Forman <lawrence@0xproject.com>
Date: Thu, 10 Oct 2019 09:31:53 +0900
Subject: [PATCH] `@0x/contracts-staking`: Add another `LibFixedMath.add()`
 test.

---
 contracts/staking/CHANGELOG.json                         | 9 +++++++++
 contracts/staking/test/unit_tests/lib_fixed_math_test.ts | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/contracts/staking/CHANGELOG.json b/contracts/staking/CHANGELOG.json
index 6ffc8f5be0..8e7a3d3a51 100644
--- a/contracts/staking/CHANGELOG.json
+++ b/contracts/staking/CHANGELOG.json
@@ -1,4 +1,13 @@
 [
+    {
+        "version": "1.1.0-beta.1",
+        "changes": [
+            {
+                "note": "Add more overflow safeguards to `LibFixedMath`",
+                "pr": "TODO"
+            }
+        ]
+    },
     {
         "version": "1.1.0-beta.0",
         "changes": [
diff --git a/contracts/staking/test/unit_tests/lib_fixed_math_test.ts b/contracts/staking/test/unit_tests/lib_fixed_math_test.ts
index e2f2c8f48c..6dd3a42fdf 100644
--- a/contracts/staking/test/unit_tests/lib_fixed_math_test.ts
+++ b/contracts/staking/test/unit_tests/lib_fixed_math_test.ts
@@ -291,6 +291,12 @@ blockchainTests('LibFixedMath unit tests', env => {
             const r = await testContract.add.callAsync(a, b);
             expect(r).to.bignumber.eq(-1);
         });
+
+        it('MAX_FIXED + (MIN_FIXED + int(1)) == 0', async () => {
+            const [a, b] = [MAX_FIXED_VALUE, MIN_FIXED_VALUE.plus(1)];
+            const r = await testContract.add.callAsync(a, b);
+            expect(r).to.bignumber.eq(0);
+        });
     });
 
     describe('sub()', () => {