使用Moq覆盖同一类中的虚方法

Question

我们正在使用Moq对我们的服务类进行单元测试,但是他们仍然坚持如何测试服务方法调用同一类的另一个服务方法的情况.我尝试将被调用的方法设置为虚拟,但仍然无法弄清楚在Moq中要做什么.例如:

public class RenewalService : IRenewalService
{
    //we've already tested this
    public virtual DateTime? GetNextRenewalDate(Guid clientId)
    {
        DateTime? nextRenewalDate = null;
        //...<snip> a ton of already tested stuff...

        return nextRenewalDate;
    }

    //but want to test this without needing to mock all 
    //the methods called in the GetNextRenewalDate method
    public bool IsLastRenewalOfYear(Renewal renewal)
    {
        DateTime? nextRenewalDate = GetNextRenewalDate(renewal.Client.Id);
        if (nextRenewalDate == null)
            throw new Exceptions.DataIntegrityException("No scheduled renewal date, cannot determine if last renewal of year");
        if (nextRenewalDate.Value.Year != renewal.RenewDate.Year)
            return true;
        return false;
    }
}

在上面的例子中,我们的GetNextRenewalDate方法非常复杂,我们已经对它进行了单元测试.但是,我们想要测试更简单的IsLastRenewalOfYear,而无需模拟GetNextRenewalDate所需的所有内容.基本上,我们只想模拟GetNextRenewalDate.

我意识到我可以创建一个覆盖GetNextRenewalDate并测试新类的新类,但有没有办法可以利用Moq来简化这个？

Answer 1

您可以在此场景中使用部分模拟,尽管您的所有方法都需要是虚拟的:

    var mock = new Moq.Mock<RenewalService>();
    mock.Setup(m => m.GetNextRenewalDate(It.IsAny<Guid>())).Returns(null);
    mock.CallBase = true;
    var results = mock.Object.IsLastRenewalOfYear(...);