public void IDictionary_NonGeneric_Add_NullValueWhenDefaultTValueIsNonNull(int count)
{
if (!IsReadOnly)
{
IDictionary dictionary = new SortedList<string, int>();
object missingKey = GetNewKey(dictionary);
Assert.Throws<ArgumentNullException>(() => dictionary.Add(missingKey, null));
Assert.Empty(dictionary);
}
}