func (m *member) InjectPartition(t testing.TB, others ...*member) {
	for _, other := range others {
		m.s.CutPeer(other.s.ID())
		other.s.CutPeer(m.s.ID())
	}
}
func (m *member) InjectPartition(t testing.TB, others ...*member) {
	for _, other := range others {
		m.s.CutPeer(other.s.ID())
		other.s.CutPeer(m.s.ID())
	}
}
// InjectPartition drops connections from m to others, vice versa.