How to do unit test for session values?

Question

Below is piece of the code of controller method(c#) :-

public ActionResult SelectProduct(string ProdName, int Block, int ProductAddressId = 0)
{
       if (ProductAddressId == 0 && Block == 1 && System.Web.HttpContext.Current.Session["ReturnProductAddressID"] != null)
       {
           ProductAddressId = (int)System.Web.HttpContext.Current.Session["ReturnProductAddressID"]; 
       }
       //other stuffs………    
}

Below is unit test method :-

   [TestMethod]
   public void SelectProduct_Condition1_Test()
   {
       //Arrange
       var controller = new ProductController();

       var prodName = string.Empty;
       var block = 1;
       var productAddressId = 0;

   //section 1
       /*var mockControllerContext = new Mock<ControllerContext>();
       var mockSession = new Mock<HttpSessionStateBase>();
       mockSession.SetupGet(s => s["ReturnProductAddressID"]).Returns("1");
       mockControllerContext.Setup(p => p.HttpContext.Session).Returns(mockSession.Object);*/

  //section 2
       /*int sessionValue = 1;
       var mockControllerContext = new Mock<ControllerContext>();
       var mockSession = new Mock<HttpSessionStateBase>();
       mockSession.SetupSet(s => s["ReturnProductAddressID"] = It.IsAny<int>()).Callback((string name, object val) => sessionValue = (int)val);
       mockSession.SetupGet(s => s["ReturnProductAddressID"]).Returns(() => sessionValue);
       mockControllerContext.Setup(p => p.HttpContext.Session).Returns(mockSession.Object);*/

       //Act         
       var actual = controller.SelectProduct(prodName,block,productAddressId);
 }

I want to ask how can i test or mock the session value up side on my action method(in if condition) ?

I have tried certain things in section 1 and section 2(commented section in unit test method above).But nothing is working for that.

So can anyone let me know how to do unit test for sessions ?

EDIT:

Nothing the above stuff working instead of below :-

System.Web.HttpContext.Current.Session["ReturnProductAddressID"] = "12";

means if i set the session value directly in unit test method.But i want to know will it be correct approach ?

Answer 1

You can use Mock. Here is how I have done before.

Download updated MoQ https://www.nuget.org/packages/moq

Moc session for the controller

var mockControllerContext = new Mock<ControllerContext>();
var mockSession = new Mock<HttpSessionStateBase>();
mockSession.SetupGet(s => s["ReturnProductAddressID"]).Returns("123"); //somevalue
mockControllerContext.Setup(p => p.HttpContext.Session).Returns(mockSession.Object);

Register mockControllerContext for controller

var controller = new YourController();
controller.ControllerContext = mockControllerContext.Object;

Finally Act

var actual = controller.SelectProduct(YourModel);

So, your code would be something like this.

    [TestMethod]
    public void SelectProduct_Condition1_Test()
    {
        var prodName = string.Empty;
        var block = 1;
        var productAddressId = 0;

        var mockControllerContext = new Mock<ControllerContext>();
        var mockSession = new Mock<HttpSessionStateBase>();
        mockSession.SetupGet(s => s["ReturnProductAddressID"]).Returns("123"); //somevalue
        mockControllerContext.Setup(p => p.HttpContext.Session).Returns(mockSession.Object);

        var controller = new ProductController();
        controller.ControllerContext = mockControllerContext.Object;

        //Act         
        var actual = controller.SelectProduct(prodName, block, productAddressId);
    }