C# Mvc 5单元测试-设置控制器的viewbag值

我有一个索引页，可以有上次搜索的

ViewBag

值。我想设置控制器，以便在调用我的测试系统之前能够设置此

ViewBag

值（

ProductManagementController

）

索引操作

[HttpPost]
public async Task<ActionResult> Index(ProductManagementVm postedVm)
{
    // Reset pagination if new search
    if (postedVm.BookSearch != ViewBag.lastSearch)
    {
        postedVm.Page = 1;
    }

    var httpResponseMessage = await_httpService.GetAsync(_urlConfigurations.GetProductList);

    var vm = _productFactory.BuildProductManagementVm(
                    await Task.Run(() => httpResponseMessage.Content.ReadAsStringAsync()), postedVm);


    vm.BookSearch = postedVm.BookSearch;

    if (string.IsNullOrEmpty(postedVm.BookSearch))
    {
        postedVm.BookSearch = string.Empty;
    }

    ViewBag.lastSearch = postedVm.BookSearch;
    return View(vm);
}

从

ViewData

属性获取其数据

public dynamic ViewBag
{
    get
    {
        if (_dynamicViewDataDictionary == null)
        {
            _dynamicViewDataDictionary = new DynamicViewDataDictionary(() => ViewData);
        }
        return _dynamicViewDataDictionary;
    }
}

因此，您需要在

ViewBag中填充您想要访问的值

这是一个POC

[TestClass]
public class ViewBagTests {
    [TestMethod]
    public void ViewBag_ShouldBe_PrePopulated() {
        //Arrange
        var SUT = new TargetController();

        var expected = "Hey I'm the old search string :D";

        SUT.ViewData["LastSearch"] = expected;

        //Act
        var actual = SUT.Index() as ViewResult;

        //Assert
        Assert.AreEqual(expected, actual.Model);
    }

    class TargetController : Controller {
        public ActionResult Index() {
            var previous = ViewBag.LastSearch;
            return View((object)previous);
        }
    }

}

这个问题解决了吗？
public dynamic ViewBag
{
    get
    {
        if (_dynamicViewDataDictionary == null)
        {
            _dynamicViewDataDictionary = new DynamicViewDataDictionary(() => ViewData);
        }
        return _dynamicViewDataDictionary;
    }
}

[TestClass]
public class ViewBagTests {
    [TestMethod]
    public void ViewBag_ShouldBe_PrePopulated() {
        //Arrange
        var SUT = new TargetController();

        var expected = "Hey I'm the old search string :D";

        SUT.ViewData["LastSearch"] = expected;

        //Act
        var actual = SUT.Index() as ViewResult;

        //Assert
        Assert.AreEqual(expected, actual.Model);
    }

    class TargetController : Controller {
        public ActionResult Index() {
            var previous = ViewBag.LastSearch;
            return View((object)previous);
        }
    }

}