IT:AD:Unit Testing/Automated:HowTo:Mock HttpContext [Notes]

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# IT:AD:Unit Testing/Automated:HowTo:Mock HttpContext #



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<panel title="Summary">

I usually forget how to set up tricky unit tests...


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## Notes ##

Here are some examples to jog my memory.


### Web ###

<sxh csharp>
        [Category("API")]
        [Test]
        [Bootstrap]
        public void SetHttpContextQuery2()
        {
            var url = "http://foo.bar/someHandler.ashx";
            HttpContext.Current = HttpContextHelper.FakeHttpContext(url, "wada=woo");
            //IMPORTANT: 
            //To Match running conditions, have to put QueryString as part of url AS WELL as in second arg.
            //See 1 and 2, compared to 3 which finally matches run time values:

            var r = HttpContext.Current.Request;

            //Shows that Url is not equal to runtime (url would include the query string)
            Assert.AreEqual(new Uri(url), r.Url);
            Assert.AreEqual("/someHandler.ashx?wada=woo", r.RawUrl);
            Assert.AreEqual("/someHandler.ashx", r.Path);
            Assert.IsTrue(r.QueryString.Count > 0);
        }
</sxh>

The above is using (which can be also found in [[Projects/XActLib/]] of course):

<sxh csharp>
/// Usage 
/// HttpContext.Current = HttpContextHelper.FakeHttpContext();
/// See: http://stackoverflow.com/a/10126711/1052767
public static HttpContext FakeHttpContext(string url = "http://fake.env/", string queryString = "", string fileName = "")
{
	var httpRequest = new HttpRequest(fileName, url, queryString);
	var stringWriter = new StringWriter();
	var httpResponce = new HttpResponse(stringWriter);
	var httpContext = new HttpContext(httpRequest, httpResponce);

	var sessionContainer = new HttpSessionStateContainer("id", new SessionStateItemCollection(),
											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;
}
</sxh>