Akka.Cluster.Tests.GossipSpec.A_gossip_must_know_who_is_youngest C# (CSharp) Method

        public void A_gossip_must_know_who_is_youngest()
        {
            // a2 and e1 is Joining
            var g1 = new Gossip(ImmutableSortedSet.Create(a2, b1.CopyUp(3), e1),
                new GossipOverview(Reachability.Empty.Unreachable(a2.UniqueAddress, e1.UniqueAddress)));
            Assert.Equal(b1, g1.YoungestMember);
            var g2 = new Gossip(ImmutableSortedSet.Create(a2, b1.CopyUp(3), e1),
                new GossipOverview(Reachability.Empty.Unreachable(a2.UniqueAddress, b1.UniqueAddress).Unreachable(a2.UniqueAddress, e1.UniqueAddress)));
            Assert.Equal(b1, g2.YoungestMember);
            var g3 = new Gossip(ImmutableSortedSet.Create(a2, b1.CopyUp(3), e2.CopyUp(4)));
            Assert.Equal(e2, g3.YoungestMember);
        }
    }