68 lines
1.8 KiB
Python
68 lines
1.8 KiB
Python
import unittest
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from django.utils.functional import lazy, lazy_property, cached_property
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class FunctionalTestCase(unittest.TestCase):
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def test_lazy(self):
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t = lazy(lambda: tuple(range(3)), list, tuple)
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for a, b in zip(t(), range(3)):
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self.assertEqual(a, b)
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def test_lazy_base_class(self):
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"""Test that lazy also finds base class methods in the proxy object"""
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class Base(object):
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def base_method(self):
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pass
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class Klazz(Base):
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pass
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t = lazy(lambda: Klazz(), Klazz)()
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self.assertTrue('base_method' in dir(t))
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def test_lazy_property(self):
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class A(object):
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def _get_do(self):
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raise NotImplementedError
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def _set_do(self, value):
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raise NotImplementedError
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do = lazy_property(_get_do, _set_do)
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class B(A):
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def _get_do(self):
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return "DO IT"
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self.assertRaises(NotImplementedError, lambda: A().do)
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self.assertEqual(B().do, 'DO IT')
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def test_cached_property(self):
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"""
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Test that cached_property caches its value,
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and that it behaves like a property
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"""
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class A(object):
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@cached_property
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def value(self):
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return 1, object()
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a = A()
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# check that it is cached
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self.assertEqual(a.value, a.value)
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# check that it returns the right thing
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self.assertEqual(a.value[0], 1)
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# check that state isn't shared between instances
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a2 = A()
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self.assertNotEqual(a.value, a2.value)
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# check that it behaves like a property when there's no instance
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self.assertIsInstance(A.value, cached_property)
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