public void When_List_AddDistinctWithComparer_Then_ItemAdded()
{
var list = ImmutableList <object> .Empty;
var item = new object();
Transactional.AddDistinct(ref list, item, EqualityComparer <object> .Default);
Assert.AreEqual(1, list.Count);
Assert.IsTrue(list.Contains(item));
}
public void When_List_AddDistinct_Twice_Then_ItemAddedOnlyOnce()
{
var list = ImmutableList <object> .Empty;
var item = new object();
var result1 = Transactional.AddDistinct(ref list, item);
var result2 = Transactional.AddDistinct(ref list, item);
Assert.AreEqual(1, list.Count);
Assert.IsTrue(list.Contains(item));
Assert.AreSame(result1, result2);
}