diff --git a/extensions/openshell/src/backend.e2e.test.ts b/extensions/openshell/src/backend.e2e.test.ts
index 4c29cd67d0a..e29fc00c587 100644
--- a/extensions/openshell/src/backend.e2e.test.ts
+++ b/extensions/openshell/src/backend.e2e.test.ts
@@ -493,9 +493,14 @@ describe("openshell sandbox backend e2e", () => {
         }
 
         await bridge.writeFile({ filePath: "nested/remote-only.txt", data: "hello-remote\n" });
-        await expect(
-          fs.readFile(path.join(workspaceDir, "nested", "remote-only.txt"), "utf8"),
-        ).rejects.toMatchObject({ code: "ENOENT" });
+        const hostReadError = await fs
+          .readFile(path.join(workspaceDir, "nested", "remote-only.txt"), "utf8")
+          .then(
+            () => undefined,
+            (error: unknown) => error,
+          );
+        expect(hostReadError).toBeInstanceOf(Error);
+        expect((hostReadError as NodeJS.ErrnoException).code).toBe("ENOENT");
         await expect(bridge.readFile({ filePath: "nested/remote-only.txt" })).resolves.toEqual(
           Buffer.from("hello-remote\n"),
         );