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from django.utils import unittest
from django.utils.functional import lazy, lazy_property
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)
def test_lazy_base_class(self):
"""Test that lazy also finds base class methods in the proxy object"""
class Base(object):
def base_method(self):
pass
class Klazz(Base):
pass
t = lazy(lambda: Klazz(), Klazz)()
self.assertTrue('base_method' in dir(t))
def test_lazy_property(self):
class A(object):
def _get_do(self):
raise NotImplementedError
def _set_do(self, value):
raise NotImplementedError
do = lazy_property(_get_do, _set_do)
class B(A):
def _get_do(self):
return "DO IT"
self.assertRaises(NotImplementedError, lambda: A().do)
self.assertEqual(B().do, 'DO IT')
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