CollectionAssert 不能等于继承 ICollection 的 class

Question

我有两个 class PCBDataHelper（下面的代码）对象，我想断言它们作为一组单元测试的一部分是相等的。但是，我无法通过测试。

public class PCBDataHelper : ICollection<string>
{
    //private List<string> pcbData = new List<string>();
    private readonly HashSet<string> pcbData = new HashSet<string>();
    private const int MaxItemLength = 16;
    private const int MaxNumberItems = 5;
    #region ICollection<string> Members

    public void Add(string item)
    {
        if (pcbData.Count == MaxNumberItems)
            throw new AIException("Max number of items reached. Cannot add item");

        if (string.IsNullOrWhiteSpace(item) || item.Length > MaxItemLength)
            throw new ArgumentException("PCBData item must not be null and have max length 16!");

        if(!pcbData.Add(item))
            throw new AIException("Cannot add item, it may already exist!");
    }

    public void Clear()
    {
        pcbData.Clear();
    }

    public bool Contains(string item)
    {
        return pcbData.Contains(item);
    }

    public void CopyTo(string[] array, int arrayIndex)
    {
        pcbData.CopyTo(array, arrayIndex);
    }

    public int Count
    {
        get { return pcbData.Count; }
    }

    public bool IsReadOnly
    {
        get { return false; }
    }

    public bool Remove(string item)
    {
        return pcbData.Remove(item);
    }

    #endregion

    #region IEnumerable<string> Members

    public IEnumerator<string> GetEnumerator()
    {
        return pcbData.GetEnumerator();
    }

    #endregion

    #region IEnumerable Members

    IEnumerator IEnumerable.GetEnumerator()
    {
        return pcbData.GetEnumerator();
    }

    #endregion
}

当我使用 Assert.AreEqual(obj1, obj2) 时，我得到以下输出：

Assert.AreEqual failed. Expected:<...HADataFile+PCBDataHelper>. Actual:<....HADataFile+PCBDataHelper>.

这让我相信这是一个集合。但是，当运行为 CollectionAssert.AreEqual(obj1, obj2) 时，我得到以下预编译错误：

cannot convert from '...HADataFile.PCBDataHelper' to 'System.Collections.ICollection'

对于两个参数。

Answer 1

ICollection<T> does not implement ICollection, so if you want to use CollectionAssert.AreEqual 那么你的 class 也需要 ICollection:

public class PCBDataHelper : ICollection<string>, ICollection
{
    // snip - you need to implement the relevant parts here
}

CollectionAssert 不能等于继承 ICollection 的 class

Cannot CollectionAssert equal a class which inherits ICollection

c#

unit-testing

mstest