CollectionAssert.AreEquivalent与自定义IEqualityComparer

public class StringIgnoreCaseComparer : IEqualityComparer<string>
{
    public bool Equals(string x, string y)
    {
        return string.Equals(x, y, StringComparison.OrdinalIgnoreCase);
    }

    public int GetHashCode(string obj)
    {
        return obj.ToLower().GetHashCode();
    }
}

var list1 = new List<string> { "a", "b", "c" };
var list2 = new List<string> { "A", "B", "C" };

CollectionAssert.AreEquivalent(list1, list2, new StringIgnoreCaseComparer());