Using Python's UnitTest Mock for a new Object

I'm trying to learn how to use Mocks for Python. However I've been struggling with some basic application of it.

Let's say our piece of code that I want to test is this:

class ProductionClass:
    def method(self):
        newone=ProductionClass()
        newone.something(1, 2, 3)
    def something(self, a, b, c):
        pass
    def __init__(self):
        print("Test")

Which have a method which is simply create a new object of itself and calls a method of that class.

import unittest
import unittest.mock
from ProductionClass import *
from unittest.mock import *

class TestProduction(unittest.TestCase):
    def test_one(self):

        real = ProductionClass()
        real.something = MagicMock()
        real.method()
        real.something.assert_called_once_with(1, 2, 3)

if __name__ == '__main__':
    unittest.main()

Once again, this is a very simple UnitTest, basically copypasted from 26.5.1.1 of http://ift.tt/17xw7Po .

However, this would test if real.something has been called, meanwhile the one i really want to test is if newone.something has been called.

Considering newone is created later when we actually call method()-method how do I use mock to test it?