Infinitely interate over array

gistfile1.txt

    public class WhatEver {
    
    private int[] _ids;
    
    public WhatEver(string Ids){
      _id = appContextIds.Split(',').Select(id => id.Trim()).Select(int.Parse).ToArray();
    }
    public IEnumerable<int?> NextId()
    {
        var etor = _ids.GetEnumerator();
        while (true)
        {
            while (etor.MoveNext())
            {
                if (etor.Current != null)
                {
                    yield return (int)etor.Current;
                }
            }
            etor.Reset();
        }
    }
}

// In test file
    [TestMethod]
    public void ProduceARepeatingListOfIds()
    {
        var results = new List<int>()
        {
            1234,
            567,
            8910,
            1234,
            567,
            8910
        };
        // object holding the NextId method
        var b = new WhatEver( "1234, 567, 8910");
        var j = 0;
        foreach (var i in b.NextId())
        {
            Assert.AreEqual(results[j], i);
            j++;
            if (results.Count == j)
            {
                break;
            }
        }

    }