diff --git a/test/debugger/appWorker.test.ts b/test/debugger/appWorker.test.ts
index 04f8bdbd9..b461a51e5 100644
--- a/test/debugger/appWorker.test.ts
+++ b/test/debugger/appWorker.test.ts
@@ -301,6 +301,12 @@ suite("appWorker", function () {
                     "http://localhost:8081/debugger-ui/debuggerWorker.js",
                 );
             });
+            test("prepareDebuggerWorkerURL should return debugger-ui URL for invalid RN versions", () => {
+                assert.strictEqual(
+                    scriptImporter.prepareDebuggerWorkerURL("not-a-semver"),
+                    "http://localhost:8081/debugger-ui/debuggerWorker.js",
+                );
+            });
             test("prepareDebuggerWorkerURL should return correct URL when debuggerWorkerUrlPath is used", () => {
                 assert.strictEqual(
                     scriptImporter.prepareDebuggerWorkerURL("0.55.4", ""),
diff --git a/test/debugger/scriptImporter.test.ts b/test/debugger/scriptImporter.test.ts
index 8d304721b..d6036bbd1 100644
--- a/test/debugger/scriptImporter.test.ts
+++ b/test/debugger/scriptImporter.test.ts
@@ -33,6 +33,13 @@ suite("scriptImporter", function () {
             );
         });
 
+        test("returns the debugger UI worker URL for invalid RN versions", function () {
+            assert.strictEqual(
+                scriptImporter.prepareDebuggerWorkerURL("not-a-semver"),
+                "http://localhost:8081/debugger-ui/debuggerWorker.js",
+            );
+        });
+
         test("uses the explicit debugger worker URL path when provided", function () {
             assert.strictEqual(
                 scriptImporter.prepareDebuggerWorkerURL("0.55.4", ""),