[英]Moq to verify certain value not predicable
为了易于解释,我有以下代码
public interface IAnother
{
void DoAnotherJob(DateTime date);
}
public class MainJob
{
private IAnother another;
public MainJob(IAnother another)
{
this.another = another;
}
public void FunctionA()
{
this.FunctionB(DateTime.Now);
}
public void FunctionB(DateTime date)
{
this.another.DoAnotherJob(date);
}
}
我需要编写一个单元测试代码,以确保何时调用FunctionA()
来调用基础IAnother.DoAnotherJob()
来使用当前日期时间。
我可以编写测试代码
[TestMethod()]
public void FunctionATest()
{
var mockAnother = new Mock<IAnother>();
var mainJob = new MainJob(mockAnother.Object);
mainJob.FunctionA();
mockAnother.Verify(x => x.DoAnotherJob(It.IsAny<DateTime>()), Times.Once);
}
以确保函数使用任何日期时间进行调用,但是由于DateTime
的实际值是不可预测的,因此我无法指定确切的值。
有任何想法吗?
要验证有关DateTime.Now
任何内容时,您总是会费劲。现在,属性值很可能在两次调用之间发生变化。 您可以做的最好的事情是这样的:
mockAnother.Verify(x => x.DoAnotherJob(It.Is<DateTime>(d > DateTime.Now.AddSeconds(-1))), Times.Once);
替代方法是引入另一个类和抽象,以用于解析DateTime
:
public interface ITimeProvider
{
DateTime Now { get; }
}
public class TimeProvider : ITimeProvider
{
DateTime Now { get { return DateTime.Now ; } }
}
然后直接使用它代替DateTime.Now
:
public class MainJob
{
private IAnother another;
private ITimeProvider timeProvider;
public MainJob(IAnother another, ITimeProvider timeProvider)
{
this.another = another;
this.timeProvider = timeProvider;
}
public void FunctionA()
{
this.FunctionB(this.timeProvider.Now);
}
public void FunctionB(DateTime date)
{
this.another.DoAnotherJob(date);
}
}
然后,您的单元测试将变为:
[TestMethod()]
public void FunctionATest()
{
var now = DateTime.Now;
var mockAnother = new Mock<IAnother>();
var mockTimeProvider = new Mock<ITimeProvider>();
mockTimeProvider.Setup(x => x.Now).Returns(now);
var mainJob = new MainJob(mockAnother.Object, mockTimeProvider.Object);
mainJob.FunctionA();
mockAnother.Verify(x => x.DoAnotherJob(now), Times.Once);
}
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