Question

我有两个列表，其中包含两个User对象。

列表内的对象的值相同。

但是当我检查此列表时，单元测试返回CollectionAssert.AreEqual失败。（索引为0的元素不匹配）。

我认为CollectionAssert.AreEqual方法不会检查列表的值，而是检查引用。

我的问题是如何比较单元测试中的两个列表的值？

public class User 
{
    public string Name { get; set; }
    public string Password { get; set; }
}

    [TestMethod]
    public void CheckUserList()
    {
        List<User> users = new List<User>()
        {
            new User(){ Name="Name",Password="Pass"},
            new User(){ Name="Name1",Password="Pass1"},
            new User(){ Name="Name2",Password="Pass2"},
        };

        List<User> users1 = new List<User>()
        {
            new User(){ Name="Name",Password="Pass"},
            new User(){ Name="Name1",Password="Pass1"},
            new User(){ Name="Name2",Password="Pass2"},
        };

        CollectionAssert.AreEqual(users, users1);
    }

Answer 1

我认为您需要为==类重写Equals()运算符或User方法。

public class User
{
    public string Name { get; set; }
    public string Password { get; set; }

    public override bool Equals(object obj)
    {
        if (obj is User another)
        {
            return Name == another.Name && Password == another.Password;
        }

        return base.Equals(obj);
    }

    public static bool operator ==(User left, User right)
    {
        return left.Equals(right);
    }

    public static bool operator !=(User left, User right)
    {
        return !left.Equals(right);
    }

}

Answer 2

足够Equal和GetHashCode方法。然后CollectionAssert.AreEqual将按预期工作

public class User 
{
    public string Name { get; set; }
    public string Password { get; set; }

    public override bool Equals(object obj)
    {
        var user = obj as User;
        return user != null &&
               Name == user.Name &&
               Password == user.Password;
    }

    public override int GetHashCode()
    {
        var hashCode = 1290039854;
        hashCode = hashCode * -1521134295 + EqualityComparer<string>.Default.GetHashCode(Name);
        hashCode = hashCode * -1521134295 + EqualityComparer<string>.Default.GetHashCode(Password);
        return hashCode;
    }
}

比较两个在单元测试中的列表

2 个答案: