public void SeveralItemsAddRangedAndRemoveRangedShouldHaveBeenContained(params string[] items)
{
var sut = new MemoryList <string>();
sut.AddRange(items);
sut.RemoveRange(0, items.Length);
foreach (var item in items)
{
Assert.True(sut.HasEverContained(item));
}
}