diff --git a/packages/upgrade/test/common/test_helpers.ts b/packages/upgrade/test/common/test_helpers.ts
index de38d1d6ba..9c7f64b919 100644
--- a/packages/upgrade/test/common/test_helpers.ts
+++ b/packages/upgrade/test/common/test_helpers.ts
@@ -69,7 +69,18 @@ export function createWithEachNg1VersionFn(setNg1: typeof setAngularJSGlobal) {
                 (prev, file) => prev.then(() => new Promise<void>((resolve, reject) => {
                                             const script = document.createElement('script');
                                             script.async = true;
-                                            script.onerror = reject;
+                                            script.onerror = () => {
+                                              // Whenever the script failed loading, browsers will
+                                              // just pass an "ErrorEvent" which does not contain
+                                              // useful information on most browsers we run tests
+                                              // against. In order to avoid writing logic to convert
+                                              // the event into a readable error and since just
+                                              // passing the event might cause people to spend
+                                              // unnecessary time debugging the "ErrorEvent", we
+                                              // create a simple error that doesn't imply that there
+                                              // is a lot of information within the "ErrorEvent".
+                                              reject(`An error occurred while loading: "${file}".`);
+                                            };
                                             script.onload = () => {
                                               document.body.removeChild(script);
                                               resolve();