private void RunToArrayOnAllCollectionTypes <T>(T[] items, Action <T[]> validation)
{
validation(Enumerable.ToArray(items));
validation(Enumerable.ToArray(new List <T>(items)));
validation(new TestEnumerable <T>(items).ToArray());
validation(new TestReadOnlyCollection <T>(items).ToArray());
validation(new TestCollection <T>(items).ToArray());
}
