public void When_List_TryAddDistinct_Then_ItemAdded()
{
var list = ImmutableList <object> .Empty;
var item = new object();
var added = Transactional.TryAddDistinct(ref list, item);
Assert.IsTrue(added);
Assert.AreEqual(1, list.Count);
Assert.IsTrue(list.Contains(item));
}
public void When_List_TryAddDistinct_Twice_Then_ItemAddedOnlyOnce()
{
var list = ImmutableList <object> .Empty;
var item = new object();
var added1 = Transactional.TryAddDistinct(ref list, item);
var result1 = list;
var added2 = Transactional.TryAddDistinct(ref list, item);
var result2 = list;
Assert.IsTrue(added1);
Assert.IsFalse(added2);
Assert.AreEqual(1, list.Count);
Assert.IsTrue(list.Contains(item));
Assert.AreSame(result1, result2);
}
