Assert.Contains 在列表中找不到对象

Question

我是单元测试的新手，我想测试一个方法，该方法获取一个字符串数组，其中包含一些名称，如“John,Doe”，然后它用“，”分割名称并填充@列表987654326@ 带有这些名称，所以我希望在返回的列表中有一个名字为 John 和姓氏 Doe 的 PersonModel，但 Assert.Contains 方法不断抛出此错误：

Assert.Contains() 失败

未找到：PersonModel { FirstName = "John", FullName = "John Doe", 姓氏 = "Doe" }

在值：列表 [PersonModel { FirstName = "John", FullName = "John Doe", LastName = "Doe" }, PersonModel { FirstName = “Jane”，FullName = “Jane Doe”，LastName = “Doe”}]

这是DataAccess类中将姓名转换为人员列表的方法：

public static List<PersonModel> ConvertCsvNamesToPeopleList(string[] csvContent)
{
    List<PersonModel> output = new List<PersonModel>();

    foreach (string line in csvContent)
    {
        string[] data = line.Split(',');
        output.Add(new PersonModel { FirstName = data[0], LastName = data[1] });
    }

    return output;
}

这是测试：

[Fact]
public void ConvertCsvNamesToPeopleList_ValidCsvContent_ShouldWork()
{
    string[] csvContent = { "John,Doe", "Jane,Doe" };

    var expectedPerson = new PersonModel { FirstName = "John", LastName = "Doe" };
    var expectedPerson2 = new PersonModel { FirstName = "Jane", LastName = "Doe" };
    var actual = DataAccess.ConvertCsvNamesToPeopleList(csvContent);

    Assert.Contains(expectedPerson, actual);
    Assert.Contains(expectedPerson2, actual);
}

人物模型：

public class PersonModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName => $"{ FirstName } { LastName }";
}

Answer 1

Contains 依赖于找到两个相等的对象，所以你应该重写它的Equals 方法。为了更好地衡量，你也应该重写它的 GetHashCode 方法，这样你就可以在需要时将它用作字典的键：

public override bool Equals(object obj)
{
    return obj is PersonModel model &&
           FirstName == model.FirstName &&
           LastName == model.LastName;
}

public override int GetHashCode()
{
    return HashCode.Combine(FirstName, LastName);
}