Moq HttpRequest 异常错误

Question

我有一个单元测试来模拟 HttpRequest 对象，试图在这个测试用例中设置模拟（VB 代码）：

    <TestMethod()>
    Public Sub Test()

        Dim Request = New Mock(Of System.Web.HttpRequestBase)()
        Dim Context = New Mock(Of System.Web.HttpContextBase)()


        Request.Setup(Function(x) x.Params("FieldName")).Returns("test")
        Context.Setup(Function(x) x.Request).Returns(Request.[Object])

       '...
       'Call controller method here.

    End Sub

但我收到异常错误消息： https://www.screencast.com/t/XiZIfO4Xam

有关此异常的任何建议。

Answer 1

Moq 只能修改可覆盖的成员。 HttpRequestBase.Params 是 NameValueCollection

您收到错误是因为 NameValueCollection 属性

Public Property Item (name As String) As String

不可覆盖。

使用实际的NameValueCollection 并将其作为Params 属性传递

<TestMethod()>
Public Sub Test()
    `Arrange
    Dim Request = New Mock(Of System.Web.HttpRequestBase)()
    Dim httpContext = New Mock(Of System.Web.HttpContextBase)()

    Dim parameters As New NameValueCollection()
    parameters("FieldName") = "test"

    Request.Setup(Function(x) x.Params).Returns(parameters)
    httpContext.Setup(Function(x) x.Request).Returns(Request.[Object])

    Dim controller = New BookingController(...)
    `assign the mock http context to controller
    controller.ControllerContext = New ControllerContext()
    controller.ControllerContext.Controller = controller
    controller.ControllerContext.HttpContext = httpContext.[Object]

    `Act
    `...

    `Assert
    `...

End Sub

现在您可以更灵活地安排模拟请求的行为