1 files changed, 2 insertions, 1 deletions
diff --git a/cli/tests/testdata/run/onload/imported.ts b/cli/tests/testdata/run/onload/imported.ts
index 969f97e56..f4157b86f 100644
--- a/cli/tests/testdata/run/onload/imported.ts
+++ b/cli/tests/testdata/run/onload/imported.ts
@@ -3,10 +3,11 @@ import { assert } from "../../../../../test_util/std/testing/asserts.ts";
 import "./nest_imported.ts";
 
 const handler = (e: Event) => {
-  assert(!e.cancelable);
+  assert(e.type === "beforeunload" ? e.cancelable : !e.cancelable);
   console.log(`got ${e.type} event in event handler (imported)`);
 };
 
 window.addEventListener("load", handler);
+window.addEventListener("beforeunload", handler);
 window.addEventListener("unload", handler);
 console.log("log from imported script");