MSTest的：CollectionAssert.AreEquivalent失败。预期集合包含1发生（S） [英] MSTest: CollectionAssert.AreEquivalent failed. The expected collection contains 1 occurrence(s) of

问题描述

问题

谁能告诉我为什么我的单元测试失败，出现此错误信息？

Can anyone tell me why my unit test is failing with this error message?

Col​​lectionAssert.AreEquivalent失败。预期集合包含1       发生（县）。实际       集合包含0出现（S）。

CollectionAssert.AreEquivalent failed. The expected collection contains 1 occurrence(s) of . The actual collection contains 0 occurrence(s).

目标

我要检查，如果两个列表是相同的。它们是相同的，如果两者都包含具有相同的属性值相同的元件。顺序是无关紧要的。

I'd like to check if two lists are identical. They are identical if both contain the same elements with the same property values. The order is irrelevant.

code例如

这是产生错误的code。 的List1 和 list2中是相同的，即对方的复制 - 粘贴。

This is the code which produces the error. list1 and list2 are identical, i.e. a copy-paste of each other.

[TestMethod]
public void TestListOfT()
{
    var list1 = new List<MyPerson>()
    {
        new MyPerson()
        {
            Name = "A",
            Age = 20
        },
        new MyPerson()
        {
            Name = "B",
            Age = 30
        }
    };
    var list2 = new List<MyPerson>()
    {
        new MyPerson()
        {
            Name = "A",
            Age = 20
        },
        new MyPerson()
        {
            Name = "B",
            Age = 30
        }
    };

    CollectionAssert.AreEquivalent(list1.ToList(), list2.ToList());
}

public class MyPerson
{
    public string Name { get; set; }
    public int Age { get; set; }
}

我也试过这条线（<一href="http://stackoverflow.com/questions/2441188/mstest-collectionassert-use-with-generics/2441448#2441448">source)

CollectionAssert.AreEquivalent(list1.ToList(), list2.ToList());

和这条线（<一href="http://stackoverflow.com/questions/662458/unittesting-ilist-with-collectionassert/662474#662474">source)

CollectionAssert.AreEquivalent(list1.ToArray(), list2.ToArray());

P.S。

相关堆栈溢出的问题：

我已经看到了这两个问题，但答案没有帮助。

I've seen both these questions, but the answers didn't help.

• Col​​lectionAssert泛型使用？
• Unittesting的IList与CollectionAssert

• CollectionAssert use with generics?
• Unittesting IList with CollectionAssert

推荐答案

您是绝对正确的。除非你提供的东西像的IEqualityComparer＆LT; MyPerson＆GT; 或实施 MyPerson.Equals（），两个 MyPerson 对象将与的Object.Equals ，就像任何其他对象。由于对象是不同的，断言将会失败。

You are absolutely right. Unless you provide something like an IEqualityComparer<MyPerson> or implement MyPerson.Equals(), the two MyPerson objects will be compared with object.Equals, just like any other object. Since the objects are different, the Assert will fail.

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