t.Fatalf("Failed to unmarshal object: %v", err)
	}

	if err := f.Update(updatedObj, "fieldmanager_test_update"); err != nil {
		t.Fatalf("failed to update object: %v", err)
	}

	if m := f.ManagedFields(); len(m) != 0 {
		t.Fatalf("managedFields were tracked on update only: %v", m)
	}