public void ValueCollection(JaggedDictionary<int, string> sut, KeyValuePair<JaggedIndex4<int>, string>[] values)
{
foreach (var kvp in values) sut[kvp.Key] = kvp.Value;
var debugView = new JaggedDictionaryValueCollectionDebugView<int, string>(sut.Values);
var items = debugView.Items;
Assert.Equal(values.Distinct().Count(), items.Length);
}