C#•16mo ago

Error during SignalR integration test: The 'InvokeCoreAsync' method cannot be called if the connecti

I get the exception System.InvalidOperationException: The 'InvokeCoreAsync' method cannot be called if the connection is not active after running this test:

public class HelpCommandTests
{
    [Fact]
    public async Task HelpCommand_Success()
    {
        const string command = "/help";
        var response = string.Empty;
        var webHostBuilder = new WebHostBuilder()
            .ConfigureServices(services =>
            {
                services.AddSignalR();
            })
            .Configure(app =>
            {
                app.UseRouting();
                app.UseEndpoints(endpoints =>
                {
                    endpoints.MapHub<ChatHub>("/chatHub");
                });
            });

        var server = new TestServer(webHostBuilder);
        var connection = new HubConnectionBuilder()
            .WithUrl(
                "http://localhost/chatHub",
                o => o.HttpMessageHandlerFactory = _ => server.CreateHandler())
            .Build();
        
        await connection.StartAsync();
        
        await connection.InvokeAsync("Command", command);
        
        connection.On<string>("Receive", msg =>
        {
            response += msg;
        });
    }
}

public class HelpCommandTests
{
    [Fact]
    public async Task HelpCommand_Success()
    {
        const string command = "/help";
        var response = string.Empty;
        var webHostBuilder = new WebHostBuilder()
            .ConfigureServices(services =>
            {
                services.AddSignalR();
            })
            .Configure(app =>
            {
                app.UseRouting();
                app.UseEndpoints(endpoints =>
                {
                    endpoints.MapHub<ChatHub>("/chatHub");
                });
            });

        var server = new TestServer(webHostBuilder);
        var connection = new HubConnectionBuilder()
            .WithUrl(
                "http://localhost/chatHub",
                o => o.HttpMessageHandlerFactory = _ => server.CreateHandler())
            .Build();
        
        await connection.StartAsync();
        
        await connection.InvokeAsync("Command", command);
        
        connection.On<string>("Receive", msg =>
        {
            response += msg;
        });
    }
}

BUT when I remove this peace of code:

typeof(ITerminalCommand).Assembly.GetTypesAssignableFrom<ITerminalCommand>().ForEach(s =>
{
    services.AddScoped(typeof(ITerminalCommand), s);
});

typeof(ITerminalCommand).Assembly.GetTypesAssignableFrom<ITerminalCommand>().ForEach(s =>
{
    services.AddScoped(typeof(ITerminalCommand), s);
});

all works fine.

2 Replies

demndev•16mo ago

ChatHub.cs if needed: https://pastebin.com/7hpAB1Pv

Pastebin

public class ChatHub : Hub{ private readonly IEnumerable

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

Accord•16mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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Programming

Error during SignalR integration test: The 'InvokeCoreAsync' method cannot be called if the connecti