public int[] SymmetricExceptWith_IntValues_CorrectResult(int[] firstSet, int[] secondSet)
        {
            AddValues(firstSet);

            _intSet.SymmetricExceptWith(secondSet);

            return(_intSet.ToArray());
        }
 public void SymmetricExceptWith_NullOther_ArgumentNullException()
 => Assert.Catch <ArgumentNullException>(() => _filledIntSet.SymmetricExceptWith(null));