Showcase different NUnit behavior for the same scenario (tested using 2.4.6 and 2.5.9.10348)

PersonTester.cs

using System.Collections;
using System.Collections.Generic;
using NUnit.Framework;

namespace ClassLibrary1
{
    public class PersonTester
    {
        [Test]
        public void are_equal()
        {
            var first = new Person {Name = "jaime"};
            var second = new Person {Name = "miguel"};
            Assert.IsFalse(first == second); // pass
            Assert.AreNotEqual(first, second); // fails
        }
    }

    public class Person : IEnumerable
    {
        private readonly IList<Person> _children;

        public Person()
        {
            _children = new List<Person>();
        }


        public string Name { get; set; }


        public void AddChild(Person child)
        {
            _children.Add(child);
        }


        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != typeof(Person)) return false;
            return Equals((Person)obj);
        }

        public bool Equals(Person other)
        {
            if (ReferenceEquals(null, other)) return false;
            if (ReferenceEquals(this, other)) return true;
            return Equals(other.Name, Name);
        }

        public override int GetHashCode()
        {
            return (Name != null ? Name.GetHashCode() : 0);
        }

        public IEnumerator GetEnumerator()
        {
            foreach (var child in _children)
            {
                yield return child;
            }
        }

    }

}