单元测试Web服务-httpContext

Here 是一个相关的讨论。

我停止引用 HttpContext.Current 直接。用这个类代替:

public class HttpContextFactory
{
    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;
    }
}

和使用 HttpContextFactory.Current 而不是 httpContext.current当前 在我们的代码中。

然后在测试中写下:

        HttpContextFactory.SetCurrentContext(GetMockedHttpContext());

其中getMockedHttpContext()来自 here 看起来是这样的:

    private System.Web.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>();

        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(x => x.Identity).Returns(identity.Object);
        identity.Setup(id => id.IsAuthenticated).Returns(true);
        identity.Setup(id => id.Name).Returns("test");

        return context.Object;
    }

它使用 mocking framework 打电话 moq

在测试项目中,必须添加对 System.Web 和 System.Web.Abstractions ,在哪里 HttpContextBase 已定义。

如果使用模拟,可以将此逻辑包装在另一个类中:

interface IAuthenticator
{
   bool IsAuthenticated();
}

实现真正的目标:

class Authenticator : IAuthenticator
{
   bool IsAuthenticated()
   {
      return HttpContext.Current.User.Identity.IsAuthenticated;
   }
}

但在测试中,创建一个模拟并返回“真”或“假”:

Mock<IAuthenticator> mock = new Mock<IAuthenticator>();
mock.Expect(x => x.IsAuthenticated()).Returns(true);

您可以考虑依赖system.web.abstractions.httpContextBase,而不是使用httpContext.current。System.Web.Abstractions程序集已经为您包装了许多常见的ASP.NET HTTP*类。它们被广泛用于ASP.NET MVC代码。如果您使用的是IOC/DI框架,那么很容易使用。例如,在ninject中:

Bind<HttpContextBase>.ToMethod(x => new HttpContextWrapper(HttpContext.Current));

然后在你的构造器中…

public class SomeWebService
{
    private HttpContextBase _httpContext;

    public SomeWebService(HttpContextBase httpContext)
    {
        _httpContext = httpContext;
    }

    public void SomeOperationNeedingAuthorization()
    {
        IIdentity userIdentity = _httpContext.User.Identity;

        if (!userIdentity.IsAuthenticated)
            return;

        // Do something here...
    }
}

这太简单了,但我希望你能明白…正如Aliostad提到的,您可以使用Rhino Mocks或MoQ等轻松模拟httpContextBase,以测试需要授权的某些操作。

我最后在Web服务上放置了一个属性:

Private mIdentity As System.Security.Principal.IIdentity
Public Property Identity() As System.Security.Principal.IIdentity
  Get
    If mIdentity Is Nothing Then mIdentity = HttpContext.Current.User.Identity
    Return mIdentity
  End Get
  Set(ByVal value As System.Security.Principal.IIdentity)
    mIdentity = value
  End Set
End Property

然后在我的Web服务方法中:

<WebMethod()> _
Public Function GetProject(ByVal projectId As Int32) As String

  If Me.Identity.IsAuthenticated Then

    'code here

  End If

End Function

然后在我的测试中(我用的是犀牛模型):

Dim mockery As New MockRepository()
Dim mockIdentity As System.Security.Principal.IIdentity = mockery.DynamicMock(Of System.Security.Principal.IIdentity)()

Dim projectService As New TeamDynamix.Enterprise.Web.Next.ProjectService()
projectService.Identity = mockIdentity
mockIdentity.Stub(Function(i As System.Security.Principal.IIdentity) i.IsAuthenticated).Return(True)

基于上面的解决方案,我在 O2 Platform 这允许这些模拟类的简单使用,例如,这就是我如何从httpRequest.inputstream中写入和读取的方法。

var mockHttpContext = new API_Moq_HttpContext();
var httpContext = mockHttpContext.httpContext();
httpContext.request_Write("<html><body>".line());
httpContext.request_Write("   this is a web page".line());  
httpContext.request_Write("</body></html>"); 
return httpContext.request_Read();

有关详细信息,请参阅此日志: http://o2platform.wordpress.com/2011/04/05/mocking-httpcontext-httprequest-and-httpresponse-for-unittests-using-moq/