public async Task SendGroupExceptAsyncDoesNotWriteToExcludedConnections(bool fromManager) { var hubProxy = new HubProxy <MyHub>(_fixture.TestCluster.Client); using (var manager = CreateNewHubLifetimeManager <MyHub>()) using (var client1 = new TestClient()) using (var client2 = new TestClient()) { var connection1 = HubConnectionContextUtils.Create(client1.Connection); var connection2 = HubConnectionContextUtils.Create(client2.Connection); await manager.OnConnectedAsync(connection1).OrTimeout(); await manager.OnConnectedAsync(connection2).OrTimeout(); if (fromManager) { await manager.AddToGroupAsync(connection1.ConnectionId, "group").OrTimeout(); await manager.AddToGroupAsync(connection2.ConnectionId, "group").OrTimeout(); await manager.SendGroupExceptAsync("group", "Hello", new object[] { "World" }, new[] { connection2.ConnectionId }).OrTimeout(); } else { await hubProxy.AddToGroupAsync(connection1.ConnectionId, "group").OrTimeout(); await hubProxy.AddToGroupAsync(connection2.ConnectionId, "group").OrTimeout(); await hubProxy.SendGroupExceptAsync("group", "Hello", new[] { connection2.ConnectionId }, "World").OrTimeout(); } await AssertMessageAsync(client1); Assert.Null(client2.TryRead()); } }