c# - 模拟参数测试

Question

我正在尝试测试传递给接口的参数是否正确：

MailMessage expectedMailMessage = new MailMessage();

var mailerMock = new Mock<IMailSender>();
mailerMock.Setup(m => m.Send(expectedMailMessage)).Verifiable();

Mailer mailer = new Mailer(mailerMock.Object);
mailer.Send(expectedMailMessage);

mailerMock.Verify(m => m.Send(expectedMailMessage), Times.Once());

邮件类：

public class Mailer : IMailer
{
    private readonly IMailSender _mailSender;
    public Mailer(IMailSender mailSender)
    {
        _mailSender = mailSender;
    }

    public void Send(MailMessage mailMessage)
    {
        _mailSender.Send(mailMessage);
    }
}

但这仍然失败，问题是很难调试。我检查了是否生成了一些随机 Guid 或设置了日期，但我找不到任何东西。

Answer 1

您正在传递mailerMock而不是传递expectedMailMessage给您的Send方法：

Mailer mailer = new Mailer(mailerMock.Object);
mailer.Send(expectedMailMessage);

Answer 2

经过一番摆弄，我放弃了，想出了这个：

mailerMock.Verify(m => m.Send(It.Is<MailMessage>(msg => msg.Subject == expectedMailMessage.Subject));
mailerMock.Verify(m => m.Send(It.Is<MailMessage>(msg => msg.Sender == expectedMailMessage.Sender));

也更容易看到它在哪个属性上失败了。