NUnit 无法处理 Lazy Instantiation

Question

我有一个延迟实例化的单例：

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 class 实现它：

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

和实现那个的class：

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 project/classes:

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!!!

运行测试 NullReferenceException 和调试测试时出现的错误，当它进入属性 (Dim test As Boolean = ConfigHandler.Instance._test) 的 Getter 时，将鼠标悬停在 Instance 有时上会出现以下错误：

'Instance' threw an exception of type 'System.Threading.ThreadAbortException'

如果我尝试进入那行代码，测试总是以以下堆栈跟踪结束：

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

我假设 Nunit 与 Lazy 配合得不好 -- 但有人知道如何解决这个问题吗？

Answer 1

原来我是在转移注意力。简单的答案是我需要将配置项放在 NUnit 项目的配置文件中，而不是主项目。

NUnit 无法处理 Lazy Instantiation

NUnit can't cope with Lazy Instantiation

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