diff --git a/packages/@lwc/integration-karma/helpers/test-utils.js b/packages/@lwc/integration-karma/helpers/test-utils.js
index 5b72251959..b87e7a29ab 100644
--- a/packages/@lwc/integration-karma/helpers/test-utils.js
+++ b/packages/@lwc/integration-karma/helpers/test-utils.js
@@ -596,18 +596,18 @@ window.TestUtils = (function (lwc, jasmine, beforeAll) {
     // Utility to handle unhandled rejections or errors without allowing Jasmine to handle them first.
     // Captures both onunhandledrejection and onerror events, since you might want both depending on
     // native vs synthetic lifecycle timing differences.
-    function catchUnhandledRejectionOrError(onUnhandledRejection) {
+    function catchUnhandledRejectionsAndErrors(onUnhandledRejectionOrError) {
         let originalOnError;
 
         const onError = (e) => {
             e.preventDefault(); // Avoids logging to the console
-            onUnhandledRejection(e);
+            onUnhandledRejectionOrError(e);
         };
 
         const onRejection = (e) => {
             // Avoids logging the error to the console, except in Firefox sadly https://bugzilla.mozilla.org/1642147
             e.preventDefault();
-            onUnhandledRejection(e.reason);
+            onUnhandledRejectionOrError(e.reason);
         };
 
         beforeEach(() => {
@@ -666,7 +666,7 @@ window.TestUtils = (function (lwc, jasmine, beforeAll) {
         IS_SYNTHETIC_SHADOW_LOADED,
         expectConsoleCalls,
         expectConsoleCallsDev,
-        catchUnhandledRejectionOrError,
+        catchUnhandledRejectionsAndErrors,
         ...apiFeatures,
     };
 })(LWC, jasmine, beforeAll);
diff --git a/packages/@lwc/integration-karma/test/component/LightningElement.errorCallback/index.spec.js b/packages/@lwc/integration-karma/test/component/LightningElement.errorCallback/index.spec.js
index c44703679f..d8f6df35f6 100644
--- a/packages/@lwc/integration-karma/test/component/LightningElement.errorCallback/index.spec.js
+++ b/packages/@lwc/integration-karma/test/component/LightningElement.errorCallback/index.spec.js
@@ -1,5 +1,5 @@
 import { createElement } from 'lwc';
-import { catchUnhandledRejectionOrError } from 'test-utils';
+import { catchUnhandledRejectionsAndErrors } from 'test-utils';
 import XBoundaryChildConstructorThrow from 'x/boundaryChildConstructorThrow';
 import XBoundaryChildConnectedThrow from 'x/boundaryChildConnectedThrow';
 import XBoundaryChildRenderThrow from 'x/boundaryChildRenderThrow';
@@ -296,7 +296,7 @@ describe('errorCallback throws after value mutation', () => {
 
     // Depending on whether native custom elements lifecycle is enabled or not, this may be an unhandled error or an
     // unhandled rejection. This utility captures both.
-    catchUnhandledRejectionOrError((error) => {
+    catchUnhandledRejectionsAndErrors((error) => {
         caughtError = error;
     });
 
diff --git a/packages/@lwc/integration-karma/test/rendering/callback-invocation-order/index.spec.js b/packages/@lwc/integration-karma/test/rendering/callback-invocation-order/index.spec.js
index 1a07b02d1c..a58ba7d429 100644
--- a/packages/@lwc/integration-karma/test/rendering/callback-invocation-order/index.spec.js
+++ b/packages/@lwc/integration-karma/test/rendering/callback-invocation-order/index.spec.js
@@ -1,5 +1,5 @@
 import { createElement } from 'lwc';
-import { catchUnhandledRejectionOrError } from 'test-utils';
+import { catchUnhandledRejectionsAndErrors } from 'test-utils';
 import ShadowParent from 'x/shadowParent';
 import ShadowLightParent from 'x/shadowLightParent';
 import LightParent from 'x/lightParent';
@@ -305,7 +305,7 @@ describe('regression test (#3827)', () => {
 
     // TODO [#4451]: synthetic shadow throws unhandled rejection errors
     // These handlers capture errors thrown in synthetic shadow mode after the rerendering happens.
-    catchUnhandledRejectionOrError((error) => {
+    catchUnhandledRejectionsAndErrors((error) => {
         caughtErrors.push(error);
     });