The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.

[Chandradev819]

I am trying to implement the Bunit in my project. But i m getting below exception.

"The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state."

Login Page Code behind C# Code

namespaceDNA.Touch.Client.Pages.Auth
{
public class LoginBase : ComponentBase, IDisposable
{
#region DI Services
[Inject] private IToastService ToastService { get; set; }
[Inject] private NavigationManager NavigationManager { get; set; }
[Inject] private ILocalStorageService StorageService { get; set; }
[Inject] private AuthenticationStateProvider AuthenticationStateProvider { get; set; }

    [Inject] public HttpClient httpClient_ { get; set; }

    #endregion

    private readonly Timer clockTimer;

    public bool IsBusy { get; set; }
    public DateTime ClockDateTime { get; set; }
    public LoginRequest LoginModel { get; set; }

    public LoginBase()
    {
       // ClientServices.Setup(Configuration);
        clockTimer = new Timer(TimeSpan.FromSeconds(2).TotalMilliseconds);
        LoginModel = new LoginRequest();
        ClockDateTime = DateTime.Now;
        IsBusy = false;
    }

    protected override async Task OnInitializedAsync()
    {
        clockTimer.Elapsed += HandleClockTimeUpdate;
        clockTimer.Enabled = true;
        await ((LocalAuthenticationStateProvider)AuthenticationStateProvider).LogoutAsync();

        var grpcData = await httpClient_.GetFromJsonAsync<GRPCChannels>("Configuration");
        var configJson = System.Text.Json.JsonSerializer.Serialize(grpcData);
        var configuration = new ConfigurationBuilder().AddJsonStream(new MemoryStream(Encoding.ASCII.GetBytes(configJson))).Build();
        ClientServices.Setup(configuration);
    }

    public async Task LoginUser()
    {
        IsBusy = true;
       
        var (success, token, id) = await ClientServices.GetAuthenticationService().LoginUserAsync(LoginModel.Email, LoginModel.Password);
        if (success)
        {
            // hack #1
            string name = (LoginModel.Email == "[email protected]" ? "chandradev" : "mohan");

            var userInfo = new LocalUserInfo()
            {
                Token = (UserToken)token,
                Email = LoginModel.Email,
                FirstName = name,
                LastName = "",
                Id = "abc123" 
            };

            await StorageService.SetItemAsync("User", userInfo);
            await AuthenticationStateProvider.GetAuthenticationStateAsync();

            NavigationManager.NavigateTo("/dashboard");
        }
        else
        {
            ToastService.ShowError("Invalid Username or Password !!", "");
        }

        IsBusy = false;
    }

    public void GoToRegister()
    {
        NavigationManager.NavigateTo("/auth/register");
    }

    void IDisposable.Dispose()
    {
        clockTimer.Elapsed -= HandleClockTimeUpdate;
    }

    private void HandleClockTimeUpdate(Object source, System.Timers.ElapsedEventArgs e)
    {
        var latestTime = DateTime.Now;
        if ((int)latestTime.TimeOfDay.TotalMinutes > (int)ClockDateTime.TimeOfDay.TotalMinutes)
        {
            ClockDateTime = latestTime;
            StateHasChanged();
        }
    }
}

}

Bunit Test Case

 [TestMethod]
    public void VerifyLoginPage()
    {
        // Arrange
        using var testContext = new Bunit.TestContext();
        var mock = testContext.Services.AddMockHttpClient();
        mock.When("/Configuration").RespondJson(new List<GRPCChannels> { });

        var toastServicemoq = new Mock<IToastService>();
        var localStorageServicemoq = new Mock<ILocalStorageService>();
        var authenticationStateProvidermoq = new Mock<AuthenticationStateProvider>();
        var navigationManagermoq=new Mock<NavigationManager>();

        testContext.Services.AddSingleton<NavigationManager>(navigationManagermoq.Object);
        testContext.Services.AddSingleton<AuthenticationStateProvider>(authenticationStateProvidermoq.Object);
        testContext.Services.AddSingleton<ILocalStorageService>(localStorageServicemoq.Object);
        testContext.Services.AddSingleton<IToastService>(toastServicemoq.Object);

        testContext.Services.AddScoped<AuthenticationStateProvider, LocalAuthenticationStateProvider>();
        
        // Act
        var cut = testContext.RenderComponent<Pages.Auth.Login>();

        // Assert
        cut.MarkupMatches("Login");
    }

[egil]

This is an exception thrown by Blazor. My best guess from reading the code is that you need to change this method like so:

    private void HandleClockTimeUpdate(Object source, System.Timers.ElapsedEventArgs e)
    {
        var latestTime = DateTime.Now;
        if ((int)latestTime.TimeOfDay.TotalMinutes > (int)ClockDateTime.TimeOfDay.TotalMinutes)
        {
            ClockDateTime = latestTime;
            InvokeAsync(() => StateHasChanged());
        }
    }