Mock.Verify 使用列表的当前值，而不是调用正在验证的方法时列表的值

Question

我有这样一种情况，我正在运行进行单元测试并调用 Verify 来断言使用非空列表作为参数调用了一个方法。被测试的方法调用方法末尾列表中的Clear()。好像调用 Verify 时，它正在检查当前时间的列表状态，而不是调用我的函数时的状态。这是预期的行为吗？有什么方法可以让 Verify 在调用我的方法时使用列表的值？

using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;
using System.Linq;
using System.Collections.Generic;

namespace Tests
{
    [TestClass]
    public class UnitTest1
    {
        public interface IMyDependency
        {
            void ParseNumbers(List<int> numbers);
        }

        public class MyDependency : IMyDependency
        {
            public void ParseNumbers(List<int> numbers)
            {
            }
        }

        public class SystemUnderTest
        {
            private IMyDependency myDependency;

            public SystemUnderTest(IMyDependency myDependency)
            {
                this.myDependency = myDependency;
            }

            public void DoSomething(List<int> numbers)
            {
                this.myDependency.ParseNumbers(numbers);

                // This causes my test to fail because Verify thinks that ParseNumbers was called
                // with an empty list as the parameter, even though the list was not empty when
                // ParseNumbers was called
                numbers.Clear();
            }
        }

        [TestMethod]
        public void TestMethod1()
        {
            var myDependency = new Mock<IMyDependency>();
            var systemUnderTest = new SystemUnderTest(myDependency.Object);

            systemUnderTest.DoSomething(new List<int> { 1, 2, 3 });

            // This succeeds
            myDependency.Verify(e => e.ParseNumbers(It.IsAny<List<int>>()), Times.Once);
        
            // This fails
            myDependency.Verify(e => e.ParseNumbers(It.Is<List<int>>(m => m.Count > 0)), Times.Once);
        }
    }
}

Answer 1

Is that the expected behavior

看起来该行为可能是一个错误。我建议向开发者提出问题。

and is there any way to have Verify use the value of the list at the time that my method was called?

进行设置Verifiable

[TestMethod]
public void TestMethod1() {
    // Arrange
    var myDependency = new Mock<IMyDependency>();
    myDependency
        .Setup(e => e.ParseNumbers(It.Is<List<int>>(m => m.Count > 0)))
        .Verifiable(); //<-- MAKE SETUP VERIFIABLE

    var systemUnderTest = new SystemUnderTest(myDependency.Object);

    // Act
    systemUnderTest.DoSomething(new List<int> { 1, 2, 3 });

    // Assert
    myDependency.Verify(); // Verifies that all verifiable expectations have been met.
}

Mock.Verify 使用列表的当前值，而不是调用正在验证的方法时列表的值

Mock.Verify uses current value of list, not the value of the list when the method being verified was called

c#

moq