C# NServiceBus 2.5.0.1442单元测试总线.CreateInstance<；界面>；在某些单元测试中返回null

我在使用Sagas进行NServiceBus单元测试时遇到了奇怪的行为

运行

• NSB 2.5.0.1442（由于IMessage而卡在此处，并且它处于多个服务中）
• NServiceBus.测试
• Resharper 8.2单元测试转轮
• VS2013更新最新rtm版本/软件包/内容

我的解决方案中有三个单元测试项目。其中只有一个引用了NServiceBus.Testing，因为它是唯一一个测试传奇的

消息。测试

服务测试（此项参考NSB测试）

ViewModelUpdater.Testing

单独运行单元测试项目，一切正常

同时运行这三个选项会导致Service.Testing中的一些测试失败。即使在调试模式下运行所有项目单元测试也会出现同样的问题

我已将问题追溯到此代码。此后，我添加了命令==null检查，以使单元测试顺利失败，而不是返回愚蠢的rhino.mocks失败

var command = Bus.CreateInstance<IEmailMessage>(a =>
{
    a.ToAddress = toAddresses;
    a.FromAddress = _formServiceEmailAddress;
    a.Subject = emailSubject;
    a.Body = body.ToString();
    a.IsHtmlBody = true;
});

if (command == null)
{
    throw new Exception("Email Message Failed to Create");
}

Bus.Send(command);

是否可能“CreateInstance”已被代理，不再工作？在我的故事中，我没有在任何地方使用Bus.CreateInstance，但是这个IEMailMessage是唯一的接口（我们所有的服务都使用它来发送到标准的电子邮件发送者服务）

我刚刚修改了另一条消息以使用Bus.CreateInstance，但这次是在一个对象上，并且遇到了相同的问题

我把同样的东西改成了Bus.Send，但没有收到同样的问题

我现在正在将我的原始代码更新为

Bus.Send<IEmailMessage>(a =>
{
    a.ToAddress = toAddresses;
    a.FromAddress = _formServiceEmailAddress;
    a.Subject = emailSubject;
    a.Body = body.ToString();
    a.IsHtmlBody = true;
});

因此，当所有测试项目都运行时，我们仍然会遇到一个问题。我想，如果我更改预期的顺序，那么在运行所有测试时，测试可能会工作，但单独运行时，它将失败

当更改IEmailMessage预期的顺序时，无论我将其放置在顺序中的什么位置（甚至在发布预期之间），我都会收到此错误消息

System.InvalidCastException : Unable to cast object of type 'CreateFormSummary' to type 'IEmailMessage'.

所以现在我的问题似乎不是它是一个接口。我将用一个具有相同属性的本地类替换IEmailMessage

创造这个

public class EmailMessage : IEmailMessage
{
    public string BCCAddress { get; set; }
    public string Body { get; set; }
    public string CCAddress { get; set; }
    public string FromAddress { get; set; }
    public bool IsHtmlBody { get; set; }
    public string Subject { get; set; }
    public string ToAddress { get; set; }
}

//replaced IEmailMessage with concrete
Bus.Send<EmailMessage>(a =>
{
    a.ToAddress = toAddresses;
    a.FromAddress = _formServiceEmailAddress;
    a.Subject = emailSubject;
    a.Body = body.ToString();
    a.IsHtmlBody = true;
}); 

//Run All Unit tests 
//output of this unit test
AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
IEmailMessage
ExpectedReceipientIs__["Manager@domain.com"]

Saga正在调用两个InstanceBus.CreateInstance

解决方案 创建接口的实现，然后不使用它。

解决方案

---

创建一个接口的实现，然后不使用它。

我所能建议的就是使用一个更新的版本。自v2.5以来，已经修复了很多错误，我们实在不可能支持它。2年前发布的版本3.2.8是我们目前仍在修补的最早版本。感谢Udi，我们正在计划升级到目前的NSB 4.5。我会更新结果。正在与金伯利讨论许可问题。

InitiatedTestSaga(command)
    .ExpectPublish<FinanceUserAccessFormSubmitted>(m => CompareSubmitted(m,command) )
    .ExpectPublish<AssignedToManager>(m =>
    {
        Console.WriteLine("AssignedToManager");
        return m.FormId == command.FormId;

    })
    .ExpectSend<CreateFormSummary>(m =>
    {
        Console.WriteLine("CreateFormSummary");
        return m.FormId == command.FormId;

    })
    .ExpectSend<CreateFormHistory>(m =>
    {
        Console.WriteLine("CreateFormHistory");
        return m.FormId == command.FormId;

    })
    .ExpectSend<UpdateFormSummary>(m =>
    {
        Console.WriteLine("UpdateFormSummary");
        return m.FormId == command.FormId;

    })
    .ExpectSend<IEmailMessage>(m =>
    {
        Console.WriteLine("IEmailMessage");
        return TestCommands.ExpectedReceipientIs(m, command.FormDetails.ManagerForApproval.EmailAddress);
    })      
    .ExpectReply<CompletionMessage>(m => m.ErrorCode == (int) ResponseCode.Success)
    .When(s => s.Handle(command));

AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
Rhino.Mocks.Exceptions.ExpectationViolationException : IBus.Send(callback method: <>c__DisplayClass2`1.<ExpectSend>b__1); Expected #1, Actual #0.

AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
IEmailMessage
ExpectedReceipientIs__["Manager@domain.com"]

System.InvalidCastException : Unable to cast object of type 'CreateFormSummary' to type 'IEmailMessage'.

public class EmailMessage : IEmailMessage
{
    public string BCCAddress { get; set; }
    public string Body { get; set; }
    public string CCAddress { get; set; }
    public string FromAddress { get; set; }
    public bool IsHtmlBody { get; set; }
    public string Subject { get; set; }
    public string ToAddress { get; set; }
}

//replaced IEmailMessage with concrete
Bus.Send<EmailMessage>(a =>
{
    a.ToAddress = toAddresses;
    a.FromAddress = _formServiceEmailAddress;
    a.Subject = emailSubject;
    a.Body = body.ToString();
    a.IsHtmlBody = true;
}); 

//Run All Unit tests 
//output of this unit test
AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
IEmailMessage
ExpectedReceipientIs__["Manager@domain.com"]

private void CreateAndSendEmail(string[] emailAddresses, string emailSubject, StringBuilder body)
{           
    string toAddresses = String.Join(",", emailAddresses);

    var msg = Bus.CreateInstance<IEmailMessage>(a=> 
    {
        a.ToAddress = toAddresses;
        a.FromAddress = _formServiceEmailAddress;
        a.Subject = emailSubject;
        a.Body = body.ToString();
        a.IsHtmlBody = true;
    })  ;

    if (msg == null)
    {
        throw new Exception("msg is null");
    }

    Bus.Send(msg);
}

//Run All Unit Tests
//output is this
AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
IEmailMessage
ExpectedReceipientIs__
["Manager@wesleymission.org.au"]

AssignedToManager
CreateFormSummary
CreateFormHistory
UpdateFormSummary
System.Exception : msg is null