I have a surface controller like this:

    using Microsoft.AspNetCore.Mvc;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Logging;
using Umbraco.Cms.Core.Routing;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Web;
using Umbraco.Cms.Infrastructure.Persistence;
using Umbraco.Cms.Web.Common.Filters;
using Umbraco.Cms.Web.Website.Controllers;

namespace MyControllers
{
    public class TestController : SurfaceController
        {
            public TestController(
            IUmbracoContextAccessor umbracoContextAccessor,
            IUmbracoDatabaseFactory databaseFactory,
            ServiceContext services,
            AppCaches appCaches,
            IProfilingLogger profilingLogger,
            IPublishedUrlProvider publishedUrlProvider)
            : base(umbracoContextAccessor, databaseFactory, services, appCaches, profilingLogger, publishedUrlProvider)
            {
            }

            [HttpPost]
            [ValidateUmbracoFormRouteString]
            public IActionResult HandleSubmit()
            {
                return RedirectToCurrentUmbracoPage();
            }

            [HttpGet]
            public IActionResult Index()
            {
                return View("FormTest");
            }

            [HttpPost]
            public IActionResult HandleTest()
            {
                return RedirectToCurrentUmbracoPage();
            }
        }
    }

and my view is like this:

@inherits Umbraco.Cms.Web.Common.Views.UmbracoViewPage 
@using Microsoft.AspNetCore.Http.Extensions
@using Umbraco.Cms.Web.Common.Models
@using Umbraco.Cms.Web.Website.Controllers
@using Umbraco.Extensions
@using MyControllers

<div class="login-status">

    @using (Html.BeginUmbracoForm<TestController>("HandleTest"))
    {
        <input type="submit" value="Test" />
    }

</div>

However, when I click "Test" I get 404 instead of redirecting. What am I doing wrong?