Akka.Cluster.Tests.ClusterDomainEventSpec.DomainEvents_must_be_produced_for_role_leader_changes C# (CSharp) Method

        public void DomainEvents_must_be_produced_for_role_leader_changes()
        {
            var g0 = Gossip.Empty;
            var g1 = new Gossip(ImmutableSortedSet.Create(aUp, bUp, cUp, dLeaving, eJoining));
            var g2 = new Gossip(ImmutableSortedSet.Create(bUp, cUp, dExiting, eJoining));
            var expected = ImmutableHashSet.Create(
                new ClusterEvent.RoleLeaderChanged("AA", aUp.Address),
                new ClusterEvent.RoleLeaderChanged("AB", aUp.Address),
                new ClusterEvent.RoleLeaderChanged("BB", bUp.Address),
                new ClusterEvent.RoleLeaderChanged("DD", dLeaving.Address),
                new ClusterEvent.RoleLeaderChanged("DE", dLeaving.Address),
                new ClusterEvent.RoleLeaderChanged("EE", eUp.Address)
                );
            Assert.Equal(expected, ClusterEvent.DiffRolesLeader(g0, g1, selfDummyAddress));
            var expected2 = ImmutableHashSet.Create(
                new ClusterEvent.RoleLeaderChanged("AA", null),
                new ClusterEvent.RoleLeaderChanged("AB", bUp.Address),
                new ClusterEvent.RoleLeaderChanged("DE", eJoining.Address)
                );
            Assert.Equal(expected2, ClusterEvent.DiffRolesLeader(g1, g2, selfDummyAddress));
        }
    }