c.listMembersFunc = func(_ time.Duration) (*clientv3.MemberListResponse, error) {
					return c.listMembers(100 * time.Millisecond)
				}
			}
			got, err := c.ListMembers()
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("ListMembers() = %v, want %v", got, tt.want)
			}
			if (err != nil) != (tt.wantError) {
				t.Errorf("ListMembers() error = %v, wantError %v", err, tt.wantError)
			}
		})
	}
}

	}

	for _, member := range resp.Members {
		if member.GetPeerURLs()[0] == peerURL {
			return member.GetID(), nil
		}
	}
	return 0, ErrNoMemberIDForPeerURL
}

// ListMembers returns the member list.
func (c *Client) ListMembers() ([]Member, error) {
	resp, err := c.listMembersFunc(0)
	if err != nil {
		return nil, err
	}

	ret := make([]Member, 0, len(resp.Members))
	for _, m := range resp.Members {

	return true, nil
}

func (c fakeTLSEtcdClient) CheckClusterHealth() error {
	return nil
}

func (c fakeTLSEtcdClient) Sync() error { return nil }

func (c fakeTLSEtcdClient) ListMembers() ([]etcdutil.Member, error) {
	return []etcdutil.Member{}, nil
}

func (c fakeTLSEtcdClient) AddMemberAsLearner(name string, peerAddrs string) ([]etcdutil.Member, error) {
	return []etcdutil.Member{}, nil
}

	klog.V(1).Info("[etcd] creating etcd client that connects to etcd pods")
	etcdClient, err := etcdutil.NewFromCluster(client, cfg.CertificatesDir)
	if err != nil {
		return err
	}

	members, err := etcdClient.ListMembers()
	if err != nil {
		return err
	}
	// If this is the only remaining stacked etcd member in the cluster, calling RemoveMember()
	// is not needed.
	if len(members) == 1 {

- Kubeadm: When adding an etcd peer to an existing cluster, if an error is returned indicating the peer has already been added, this is accepted and a `ListMembers` call is used instead to return the existing cluster. This helps to diminish the exponential backoff when the first AddMember call times out, while still retaining a similar performance when the peer has already been added from a previous call....