vsto excel工作簿单元测试

Question

我正在为VSTO excel工作簿项目创建单元测试用例。我在thisworkbook.cs文件中有以下方法。

public void ValidateOnOpen(ICredentials credential)
    {
        if (credential != null)
        {
            WorkbookSettings.WindowsCredentials = credential;
        }
        else
        {
            this.Save(); 
            Application.Quit();
            this.Close();
        }
    }

当我为此方法创建单元测试用例时，代码如下所示。

 [TestMethod()]
    public void ValidateOnOpenTest()
    {
        Factory factory = null;                         
        IServiceProvider serviceProvider = null; 
        ThisWorkbook target = new ThisWorkbook(factory, serviceProvider); 
        ICredentials credential = null; 
        target.ValidateOnOpen(credential);           
    }

请告诉我如何使用Factory和Iserviceprovider初始化以下行

ThisWorkbook target = new ThisWorkbook(factory, serviceProvider); 

谢谢， 苏雷什