什么是测试序列化的最佳方法？

Question

using System;
using System.Xml.Serialization;
using System.IO;

namespace Mailer {
    public class ClientConfiguration {

        public virtual bool Save(string fileName) {
            XmlSerializer serializer = new XmlSerializer(typeof(ClientConfiguration));
            using (StreamWriter writer = new StreamWriter(fileName)) {
                serializer.Serialize(writer, this);
            }
            return true;
        }
    }
}

在上面的代码中,我想存根/模拟serializer.Serialize方法以确保调用该方法.我用moq和NMock尝试了很多方法但是失败了.

请帮助我存根/模拟对序列化程序的调用.

Answer 1

除非您使用Typemock Isolator或Moles,否则不能替换使用new关键字在内部创建的任何内容.

您需要首先从XmlSerializer中提取接口,然后将其注入到类中.

例如,您可以介绍此接口:

public interface IXmlSerializer
{
    public void Serialize(Stream stream, object o);
}

将它注入您的Mailer类中,如下所示:

public class ClientConfiguration
{
    private readonly IXmlSerializer serializer;

    public ClientConfiguration(IXmlSerializer serializer)
    {
        if (serializer == null)
        {
            throw new ArgumentNullException("serializer");
        }
        this.serializer = serializer;
    }

    public virtual bool Save(string fileName)
    {
        using (StreamWriter writer = new StreamWriter(fileName))
        {
            this.serializer.Serialize(writer, this);
        }
        return true;
    }
}

现在您可以将模拟注入到类中:

var mock = new Mock<IXmlSerializer>();
var sut = new ClientConfiguration(mock.Object);

上面的例子使用Moq.