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

        public void A_gossip_must_merge_seen_table_correctly()
        {
            var vclockNode = VectorClock.Node.Create("something");
            var g1 =
                new Gossip(ImmutableSortedSet.Create(a1, b1, c1, d1)).Increment(vclockNode)
                    .Seen(a1.UniqueAddress)
                    .Seen(b1.UniqueAddress);
            var g2 =
                new Gossip(ImmutableSortedSet.Create(a1, b1, c1, d1)).Increment(vclockNode)
                    .Seen(a1.UniqueAddress)
                    .Seen(c1.UniqueAddress);
            var g3 = g1.Copy(version: g2.Version).Seen(d1.UniqueAddress);

            Action<Gossip> checkMerge = (m) =>
            {
                var seen = m.Overview.Seen;
                Assert.Equal(0, seen.Count());

                Assert.False(m.SeenByNode(a1.UniqueAddress));
                Assert.False(m.SeenByNode(b1.UniqueAddress));
                Assert.False(m.SeenByNode(c1.UniqueAddress));
                Assert.False(m.SeenByNode(d1.UniqueAddress));
                Assert.False(m.SeenByNode(e1.UniqueAddress));
            };

            checkMerge(g3.Merge(g2));
            checkMerge(g2.Merge(g3));
        }