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)
	}

	}
	before = f.Live()
	// Wait to make sure the timestamp is different
	time.Sleep(time.Second)
	if err := f.Update(obj.DeepCopyObject(), "fieldmanager_test_update"); err != nil {
		t.Fatalf("failed to update object: %v", err)
	}
	if !reflect.DeepEqual(before, f.Live()) {
		t.Fatalf("No-op update has changed the object:\n%v\n---\n%v", before, f.Live())
	}

		}
		obj.SetKind("Pod")
		obj.SetAPIVersion("v1")
		return obj
	}

	if err := f.Update(podWithLabels("one"), "fieldmanager_test_update_1"); err != nil {
		t.Fatalf("failed to update object: %v", err)
	}
	expectIdempotence(t, f)

	if err := f.Update(podWithLabels("one", "two"), "fieldmanager_test_update_2"); err != nil {
		t.Fatalf("failed to update object: %v", err)
	}
	expectIdempotence(t, f)