diff --git a/packages/osc/tests/bundle-decode.test.js b/packages/osc/tests/bundle-decode.test.js
index a72f4f1..a9bceda 100644
--- a/packages/osc/tests/bundle-decode.test.js
+++ b/packages/osc/tests/bundle-decode.test.js
@@ -1,4 +1,4 @@
-const { deepEqual } = require('assert');
+const { deepEqual, equal } = require('assert');
 const { describe, it } = require('node:test');
 const osc = require('../dist/index');
 
@@ -25,7 +25,8 @@ const tests = [
 describe('OSC Bundle Decoding', () => {
   tests.forEach((bundleTest) => {
     it(bundleTest.description, () => {
-      const encoded = osc.bundleFromBuffer(bundleTest.bytes);
+      const [encoded, remainingBytes] = osc.bundleFromBuffer(bundleTest.bytes);
+      equal(remainingBytes.length, 0)
       deepEqual(encoded, bundleTest.expected);
     });
   });
diff --git a/packages/osc/tests/message-decode.test.js b/packages/osc/tests/message-decode.test.js
index 9051689..5dd97a1 100644
--- a/packages/osc/tests/message-decode.test.js
+++ b/packages/osc/tests/message-decode.test.js
@@ -1,4 +1,4 @@
-const { deepEqual, throws } = require('assert');
+const { deepEqual, throws, equal } = require('assert');
 const { describe, it } = require('node:test');
 const osc = require('../dist/index');
 
@@ -69,7 +69,8 @@ const tests = [
 describe('OSC Message Decoding', () => {
   tests.forEach((messageTest) => {
     it(messageTest.description, () => {
-      const decoded = osc.messageFromBuffer(messageTest.bytes);
+      const [decoded, remainingBytes] = osc.messageFromBuffer(messageTest.bytes);
+      equal(remainingBytes.length, 0)
       deepEqual(decoded, messageTest.expected);
     });
   });