MOQ 错误预期在模拟上调用一次，但为 0 次

Question

我是 MOQ 的新手，我已阅读快速入门 here。我正在使用 MOQ v4.2.1402.2112。我正在尝试创建一个用于更新人员对象的单元测试。 UpdatePerson 方法返回更新后的人员对象。谁能告诉我如何纠正这个问题？

我收到此错误：

Moq.MockException was unhandled by user code 
HResult=-2146233088
Message=Error updating Person object
Expected invocation on the mock once, but was 0 times: svc => svc.UpdatePerson(.expected)
Configured setups: svc => svc.UpdatePerson(It.IsAny<Person>()), Times.Never
No invocations performed.
  Source=Moq
  IsVerificationError=true

这是我的代码：

    [TestMethod]
    public void UpdatePersonTest()
    {
        var expected = new Person()
        {
            PersonId = new Guid("some guid value"),
            FirstName = "dev",
            LastName = "test update",
            UserName = "dev@test.com",
            Password = "password",
            Salt = "6519",
            Status = (int)StatusTypes.Active
        };

        PersonMock.Setup(svc => svc.UpdatePerson(It.IsAny<Person>())) 
            .Returns(expected) 
            .Verifiable();

        var actual = PersonProxy.UpdatePerson(expected);

        PersonMock.Verify(svc => svc.UpdatePerson(It.IsAny<Person>()), Times.Once(), "Error updating Person object");

        Assert.AreEqual(expected, actual, "Not the same.");
    }

Answer 1

用这条线

PersonMock.Verify(svc => svc.UpdatePerson(It.IsAny<Person>()), 
                  Times.Once(), // here
                  "Error updating Person object");

您正在对模拟设置期望 UpdatePerson 方法应该被调用一次。它失败了，因为您的 SUT（您正在测试的类）根本没有调用此方法：

未执行任何调用

还要验证您是否将模拟对象传递给PersonProxy。它应该是这样的：

PersonProxy = new PersonProxy(PersonMock.Object);

及实施

public class PersonProxy
{
    private IPersonService service; // assume you are mocking this interface

    public PersonProxy(IPersonService service) // constructor injection
    {
        this.service = service;
    }

    public Person UpdatePerson(Person person)
    {
         return service.UpdatePerson(person);
    }
}