public async Task InvokeGroupAsync_WritesTo_AllConnections_InGroups_Output()
        {
            using (var client1 = new TestClient())
                using (var client2 = new TestClient())
                {
                    var manager     = new OrleansHubLifetimeManager <MyHub>(new LoggerFactory().CreateLogger <OrleansHubLifetimeManager <MyHub> >(), this._fixture.ClientProvider);
                    var connection1 = HubConnectionContextUtils.Create(client1.Connection);
                    var connection2 = HubConnectionContextUtils.Create(client2.Connection);

                    await manager.OnConnectedAsync(connection1);

                    await manager.OnConnectedAsync(connection2);

                    await manager.AddToGroupAsync(connection1.ConnectionId, "gunit");

                    await manager.AddToGroupAsync(connection2.ConnectionId, "tupac");

                    await manager.SendGroupsAsync(new string[] { "gunit", "tupac" }, "Hello", new object[] { "World" });

                    await AssertMessageAsync(client1);
                    await AssertMessageAsync(client2);
                }
        }