From ae21501aa21319ad305b17c451e9d0907e134f1b Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Thu, 21 May 2020 20:39:57 -0500
Subject: [PATCH] test sumComplement32

---
 src/utils/math.test.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/utils/math.test.ts b/src/utils/math.test.ts
index 36c31a09..c0197710 100644
--- a/src/utils/math.test.ts
+++ b/src/utils/math.test.ts
@@ -1,4 +1,4 @@
-import { fmod } from './math';
+import { fmod, sumComplement32 } from './math';
 
 test('fmod of positive numbers', () => {
     expect(fmod(3, 4)).toBe(3 % 4);
@@ -7,3 +7,10 @@ test('fmod of positive numbers', () => {
 test('fmod of negative and positive number', () => {
     expect(fmod(-3, 4)).toBe(1);
 });
+
+test('sumComplement32', () => {
+    // basic test
+    expect(sumComplement32([1, 2, 3, 4, 5])).toBe(-(1 + 2 + 3 + 4 + 5));
+    // overflow
+    expect(sumComplement32([0xffffffff, 0xffffffff])).toBe(-(-1 + -1));
+});