public class LogAnalyzer
{
    private IWebService service;
    private IEmailService email;

    public IWebService Service
    {
        get { return service; }
        set { service = value; }
    }

    public IEmailService Email
    {
        get { return email; }
        set { email = value; }
    }

    public void Analyze(string fileName)
    {
        if (fileName.Length < 8)
        {
            try
            {
                service.LogError("the file name is to short" + fileName);
            }
            catch (Exception e)
            {
                email.SendEmail("From@test.com", "To@test.com", "IWebServiceFailed", e.Message);
            }
        }
    }
}

public class StubWebService : IWebService
{
    public void LogError(string message)
    {
        throw new Exception("StubWebService throw exception");
    }
}

public class MockEmailService : IEmailService
{
    public string To;
    public string From;
    public string Subject;
    public string Message;

    public void SendEmail(string to, string from, string subject, string message)
    {
        To = to;
        From = from;
        Subject = subject;
        Message = message;
    }
}

[TestMethod]
public void TestMethod1()
{
    StubWebService stubWebService = new StubWebService();
    MockEmailService mockEmailSender = new MockEmailService();

    LogAnalyzer log = new LogAnalyzer();
    log.Emailservice = mockEmailSender;
    log.WebService = stubWebService;

    // Act
    string tooShortFileName = "1.txt";
    log.Analyze(tooShortFileName);

    // Assert
    Assert.AreEqual("to@test.com", mockEmailSender.To);
    Assert.AreEqual("from@test.com", mockEmailSender.From);
    Assert.AreEqual("WebSerive log error", mockEmailSender.Subject);
}