}
	}
	// new ReplicaSet does not exist.
	return nil
}

// FindOldReplicaSets returns the old replica sets targeted by the given Deployment, with the given slice of RSes.
// Note that the first set of old replica sets doesn't include the ones with no pods, and the second set of old replica sets include all old replica sets.
func FindOldReplicaSets(deployment *apps.Deployment, rsList []*apps.ReplicaSet) ([]*apps.ReplicaSet, []*apps.ReplicaSet) {

func (dc *DeploymentController) getAllReplicaSetsAndSyncRevision(ctx context.Context, d *apps.Deployment, rsList []*apps.ReplicaSet, createIfNotExisted bool) (*apps.ReplicaSet, []*apps.ReplicaSet, error) {
	_, allOldRSs := deploymentutil.FindOldReplicaSets(d, rsList)

	// Get new replica set with the updated revision number
	newRS, err := dc.getNewReplicaSet(ctx, d, rsList, allOldRSs, createIfNotExisted)
	if err != nil {
		return nil, nil, err
	}

			rsList:          []*apps.ReplicaSet{&newRS},
			expected:        nil,
			expectedRequire: nil,
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			requireRS, allRS := FindOldReplicaSets(&test.deployment, test.rsList)
			sort.Sort(controller.ReplicaSetsByCreationTimestamp(allRS))
			sort.Sort(controller.ReplicaSetsByCreationTimestamp(test.expected))
			if !reflect.DeepEqual(allRS, test.expected) {