在单元测试中设置HttpContext.Current.Session
我有一个Web服务，我正在尝试单元测试。 在服务中，它从HttpContext提取几个值，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;
但是，每当我尝试设置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为空。
有没有办法在单元测试中初始化当前会话？
我们不得不通过使用HttpContextManager来嘲讽HttpContext并从我们的应用程序中调用工厂以及单元测试
public class HttpContextManager
{
private static HttpContextBase m_context;
public static HttpContextBase Current
{
get
{
if (m_context != null)
return m_context;
if (HttpContext.Current == null)
throw new InvalidOperationException("HttpContext not available");
return new HttpContextWrapper(HttpContext.Current);
}
}
public static void SetCurrentContext(HttpContextBase context)
{
m_context = context;
}
}
然后，您将使用HttpContextManager.Current替换对HttpContext.Current任何调用，并且可以访问相同的方法。 然后当你测试时，你也可以访问HttpContextManager并嘲笑你的期望
这是一个使用Moq的例子：
private HttpContextBase GetMockedHttpContext()
{
var context = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>();
var response = new Mock<HttpResponseBase>();
var session = new Mock<HttpSessionStateBase>();
var server = new Mock<HttpServerUtilityBase>();
var user = new Mock<IPrincipal>();
var identity = new Mock<IIdentity>();
var urlHelper = new Mock<UrlHelper>();
var routes = new RouteCollection();
MvcApplication.RegisterRoutes(routes);
var requestContext = new Mock<RequestContext>();
requestContext.Setup(x => x.HttpContext).Returns(context.Object);
context.Setup(ctx => ctx.Request).Returns(request.Object);
context.Setup(ctx => ctx.Response).Returns(response.Object);
context.Setup(ctx => ctx.Session).Returns(session.Object);
context.Setup(ctx => ctx.Server).Returns(server.Object);
context.Setup(ctx => ctx.User).Returns(user.Object);
user.Setup(ctx => ctx.Identity).Returns(identity.Object);
identity.Setup(id => id.IsAuthenticated).Returns(true);
identity.Setup(id => id.Name).Returns("test");
request.Setup(req => req.Url).Returns(new Uri("http://www.google.com"));
request.Setup(req => req.RequestContext).Returns(requestContext.Object);
requestContext.Setup(x => x.RouteData).Returns(new RouteData());
request.SetupGet(req => req.Headers).Returns(new NameValueCollection());
return context.Object;
}
然后在你的单元测试中使用它，我在我的Test Init方法中调用它
HttpContextManager.SetCurrentContext(GetMockedHttpContext());
那么你可以在上面的方法中添加你希望可用于Web服务的Session的预期结果。
你可以通过创建一个新的HttpContext来“伪造”它：
http://www.necronet.org/archive/2010/07/28/unit-testing-code-that-uses-httpcontext-current-session.aspx
我已经把这段代码放在了一个静态辅助类中，像这样：
public static HttpContext FakeHttpContext()
{
var httpRequest = new HttpRequest("", "http://stackoverflow/", "");
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;
}
或者不使用反射来构造新的HttpSessionState实例，您可以将HttpSessionStateContainer附加到HttpContext （按照Brent M. Spell的评论）：
SessionStateUtility.AddHttpSessionStateToContext(httpContext, sessionContainer);
然后你可以在你的单元测试中调用它：
HttpContext.Current = MockHelper.FakeHttpContext();
米洛克斯解决方案比接受的一个恕我直言，但我在处理网址与查询字符串时，这个实现有一些问题。
我做了一些改变，使其能够与任何网址正常工作并避免反射。
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;
}