Question

我有一个懒惰实例化的单身人士：

Public Class SingletonBase(Of TDerivedClass As {SingletonBase(Of TDerivedClass)})
    Private Shared ReadOnly _instance As New Lazy(Of TDerivedClass)(Function() CType(Activator.CreateInstance(GetType(TDerivedClass), True), TDerivedClass), Threading.LazyThreadSafetyMode.ExecutionAndPublication)

    ''' <summary>
    ''' Using the Singleton pattern allows the config handler to be observable
    ''' </summary>
    ''' <returns></returns>
    Public Shared ReadOnly Property Instance() As TDerivedClass
        Get
            Return _instance.Value
        End Get
    End Property
End Class

然后是实现它的类：

Public MustInherit Class ConfigurationHandlerBase(Of TDerivedConfigHandler As {SingletonBase(Of TDerivedConfigHandler)})
    Inherits SingletonBase(Of TDerivedConfigHandler)

和实现那个的类：

Public Class ConfigHandler
    Inherits ConfigurationHandlerBase(Of ConfigHandler)
    Private _test As String
    Public Shared ReadOnly Property Test as String
        Get
            Return Instance._test
        End Get
    End Property

然后我有一个NUnit项目/类：

Imports NUnit.Framework
<TestFixture>
Public Class ConfigHandlerTests
    <Test>
    Public Sub Test()
        Dim success As ConfigHandler = ConfigHandler.Instance ' this works
        Dim fail as String = ConfigHandler.Test ' this fails!!!

当运行测试是NullReferenceException时，我得到的错误，以及调试测试，当它进入属性的Getter时（{{ 1}}），将鼠标悬停在Dim test As Boolean = ConfigHandler.Instance._test 有时会出现以下错误：

＆＃39;实例＆＃39;抛出了＃System; Thhreading.ThreadAbortException＆＃39;
类型的异常

总是如果我尝试进入该行代码，测试将以下面的堆栈跟踪结束：

Instance

我假设Nunit与Result StackTrace: at NUnit.Framework.Internal.Reflect.InvokeMethod(MethodInfo method, Object fixture, Object[] args) at NUnit.Framework.Internal.MethodWrapper.Invoke(Object fixture, Object[] args) at NUnit.Framework.Internal.Commands.TestMethodCommand.RunNonAsyncTestMethod(TestExecutionContext context) at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context) at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context) at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.Execute(TestExecutionContext context) Result Message: Test cancelled by user玩得不好 - 但有没有人知道如何解决这个问题？

Answer 1

原来我正在吃红鲱鱼。简单的答案是我需要配置项在NUnit项目的配置文件中，而不是主项目。

NUnit无法应对Lazy Instantiation

1 个答案: