How to Mock HttpContext.Current.Session for Unit Testing?

Unit Testing Code that Utilizes HttpContext.Current.Session

Question:

While attempting to unit test a web service, I encounter a null reference exception when setting HttpContext.Current.Session values. Despite creating the context using a SimpleWorkerRequest, HttpContext.Current.Session remains null. How can I initialize the current session within the unit test?

Answer:

To mock the HttpContext and its session object, you can employ one of two approaches:

1. Using Reflection:

   <br>public static HttpContext FakeHttpContext()<br>{<br> var httpRequest = new HttpRequest("", "http://example.com/", "");<br> var stringWriter = new StringWriter();<br> var httpResponse = new HttpResponse(stringWriter);<br> var httpContext = new HttpContext(httpRequest, httpResponse);</p>
   <p>var sessionContainer = new HttpSessionStateContainer("id", new SessionStateItemCollection(),</p>
   <pre class="brush:php;toolbar:false">                                     new HttpStaticObjectsCollection(), 10, true,
                                        HttpCookieMode.AutoDetect,
                                        SessionStateMode.InProc, false);
   

   httpContext.Items["AspSession"] = typeof(HttpSessionState).GetConstructor(

                            BindingFlags.NonPublic | BindingFlags.Instance,
                            null, CallingConventions.Standard,
                            new[] { typeof(HttpSessionStateContainer) },
                            null)
                    .Invoke(new object[] { sessionContainer });
   

   return httpContext;
   }
   

2. Using SessionStateUtility:

   <br>SessionStateUtility.AddHttpSessionStateToContext(httpContext, sessionContainer);<br> 

Once you have created the mock HttpContext, you can set it as the current context for your unit tests:

<br>HttpContext.Current = MockHelper.FakeHttpContext();<br>

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