1 files changed, 4 insertions, 0 deletions
diff --git a/test/content/operators/impls/MockConsoleFramePresenter.ts b/test/content/operators/impls/MockConsoleFramePresenter.ts
index f8ac70b..23bc27f 100644
--- a/test/content/operators/impls/MockConsoleFramePresenter.ts
+++ b/test/content/operators/impls/MockConsoleFramePresenter.ts
@@ -19,4 +19,8 @@ export default class MockConsoleFramePresenter
   resize(_width: number, _height: number): void {
     throw new Error("not implemented");
   }
+
+  isTopWindow(): boolean {
+    return true;
+  }
 }