lib/django-1.3/tests/regressiontests/utils/functional.py

from django.utils import unittest
from django.utils.functional import lazy


class FunctionalTestCase(unittest.TestCase):
    def test_lazy(self):
        t = lazy(lambda: tuple(range(3)), list, tuple)
        for a, b in zip(t(), range(3)):
            self.assertEqual(a, b)