Unit test Class in MVC

Question

I have following class in my project

 public class Data
    {
         public void Getdata(){
            var user =  HttpContext.User.Identity.Name;
        }
    }

It is showing null reference exception

It works nicely for Controller, but not for class as Class does not have ControllerContext . Any help?

public class Data() { var user = HttpContext.User.Identity.Name; } is it typo? — hmnzr
– hmnzr, Commented May 25, 2015 at 13:26
it should be HttpContext.Current, right? stackoverflow.com/questions/4379450/… — Khanh TO
– Khanh TO, Commented May 25, 2015 at 13:32
@KhanhTO Controller has ControllerContext so we can set up fake context. But do i do it for class? — Richa
– Richa, Commented May 25, 2015 at 13:33

Andrew Whitaker · Accepted Answer · 2015-05-25 13:42:13Z

2

You could restructure your class a little to test it in a similar way. One way would be to add a constructor that accepts an HttpContextBase:

public class Data
{
    private HttpContextBase contextBase;

    public Data(HttpContextBase context)
    {
        this.context = context;
    }

    public Data() : this(new HttpContextWrapper(HttpContext.Current))
    {
    }

    public void GetData()
    {
        var user = this.context.User.Identity.Name
    }
}

Then you could pass in your mocked HttpContextBase during your unit test.

[TestMethod]
public void Test()
{
    var fakeHttpContext = new Mock<HttpContextBase>();
    var fake = new GenericIdentity("user");
    var prin = new GenericPrincipal(fakeIdentity, null);

    fakeHttpContext.Setup(t => t.User).Returns(prin);

    var data = new Mock<Data>(fakeHttpContext.Object);

    // Now you can successfully call data.GetData()
}

edited May 25, 2015 at 13:42

answered May 25, 2015 at 13:34

Andrew Whitaker

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