我有一个web服务，我试图单元测试。在服务中，它从HttpContext中提取了几个值，如下所示:
m_password = (string)HttpContext.Current.Session["CustomerId"];
m_userID = (string)HttpContext.Current.Session["CustomerUrl"];
在单元测试中，我使用一个简单的工作请求创建上下文，如下所示:
SimpleWorkerRequest request = new SimpleWorkerRequest("", "", "", null, new StringWriter());
HttpContext context = new HttpContext(request);
HttpContext.Current = context;
然而，每当我试图设置HttpContext.Current.Session的值时
HttpContext.Current.Session["CustomerId"] = "customer1";
HttpContext.Current.Session["CustomerUrl"] = "customer1Url";
我得到空引用异常，说HttpContext.Current.Session是空的。
是否有方法在单元测试中初始化当前会话?
你可以通过创建一个新的HttpContext来“伪造”它，就像这样:
http://www.necronet.org/archive/2010/07/28/unit-testing-code-that-uses-httpcontext-current-session.aspx
我把这段代码放到一个静态helper类中，如下所示:
public static HttpContext FakeHttpContext()
{
var httpRequest = new HttpRequest("", "http://example.com/", "");
var stringWriter = new StringWriter();
var httpResponse = new HttpResponse(stringWriter);
var httpContext = new HttpContext(httpRequest, httpResponse);
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;
}
或者不是使用反射来构造新的httpessionstate实例，你可以将你的httpessionstatecontainer附加到HttpContext(根据Brent M. Spell的评论):
SessionStateUtility.AddHttpSessionStateToContext(httpContext, sessionContainer);
然后你可以像这样在单元测试中调用它:
HttpContext.Current = MockHelper.FakeHttpContext();
试试这个方法。
public static HttpContext getCurrentSession()
{
HttpContext.Current = new HttpContext(new HttpRequest("", ConfigurationManager.AppSettings["UnitTestSessionURL"], ""), new HttpResponse(new System.IO.StringWriter()));
System.Web.SessionState.SessionStateUtility.AddHttpSessionStateToContext(
HttpContext.Current, new HttpSessionStateContainer("", new SessionStateItemCollection(), new HttpStaticObjectsCollection(), 20000, true,
HttpCookieMode.UseCookies, SessionStateMode.InProc, false));
return HttpContext.Current;
}
Milox解决方案比IMHO接受的解决方案更好，但我在处理url时遇到了一些问题。
我做了一些改变，使它能正常工作与任何url和避免反射。
public static HttpContext FakeHttpContext(string url)
{
var uri = new Uri(url);
var httpRequest = new HttpRequest(string.Empty, uri.ToString(),
uri.Query.TrimStart('?'));
var stringWriter = new StringWriter();
var httpResponse = new HttpResponse(stringWriter);
var httpContext = new HttpContext(httpRequest, httpResponse);
var sessionContainer = new HttpSessionStateContainer("id",
new SessionStateItemCollection(),
new HttpStaticObjectsCollection(),
10, true, HttpCookieMode.AutoDetect,
SessionStateMode.InProc, false);
SessionStateUtility.AddHttpSessionStateToContext(
httpContext, sessionContainer);
return httpContext;
}
我正在寻找一种比上面提到的选项更少侵入性的东西。最后，我提出了一个俗气的解决方案，但它可能会让一些人行动得更快一些。
首先，我创建了一个TestSession类:
class TestSession : ISession
{
public TestSession()
{
Values = new Dictionary<string, byte[]>();
}
public string Id
{
get
{
return "session_id";
}
}
public bool IsAvailable
{
get
{
return true;
}
}
public IEnumerable<string> Keys
{
get { return Values.Keys; }
}
public Dictionary<string, byte[]> Values { get; set; }
public void Clear()
{
Values.Clear();
}
public Task CommitAsync()
{
throw new NotImplementedException();
}
public Task LoadAsync()
{
throw new NotImplementedException();
}
public void Remove(string key)
{
Values.Remove(key);
}
public void Set(string key, byte[] value)
{
if (Values.ContainsKey(key))
{
Remove(key);
}
Values.Add(key, value);
}
public bool TryGetValue(string key, out byte[] value)
{
if (Values.ContainsKey(key))
{
value = Values[key];
return true;
}
value = new byte[0];
return false;
}
}
然后我在控制器的构造函数中添加了一个可选参数。如果该参数存在，则将其用于会话操作。否则，使用HttpContext。会话:
class MyController
{
private readonly ISession _session;
public MyController(ISession session = null)
{
_session = session;
}
public IActionResult Action1()
{
Session().SetString("Key", "Value");
View();
}
public IActionResult Action2()
{
ViewBag.Key = Session().GetString("Key");
View();
}
private ISession Session()
{
return _session ?? HttpContext.Session;
}
}
现在我可以将我的TestSession注入到控制器中:
class MyControllerTest
{
private readonly MyController _controller;
public MyControllerTest()
{
var testSession = new TestSession();
var _controller = new MyController(testSession);
}
}
如果您正在使用MVC框架，这应该可以工作。我使用Milox的FakeHttpContext并添加了一些额外的代码行。这个想法来自这个帖子:
http://codepaste.net/p269t8
这似乎在MVC 5中工作。我还没有尝试在早期版本的MVC。
HttpContext.Current = MockHttpContext.FakeHttpContext();
var wrapper = new HttpContextWrapper(HttpContext.Current);
MyController controller = new MyController();
controller.ControllerContext = new ControllerContext(wrapper, new RouteData(), controller);
string result = controller.MyMethod();
