94 lines
2.5 KiB
Python
94 lines
2.5 KiB
Python
import unittest
|
|
|
|
from django.utils.functional import lazy, lazy_property, cached_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')
|
|
|
|
def test_cached_property(self):
|
|
"""
|
|
Test that cached_property caches its value,
|
|
and that it behaves like a property
|
|
"""
|
|
|
|
class A(object):
|
|
|
|
@cached_property
|
|
def value(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
def other_value(self):
|
|
return 1
|
|
|
|
other = cached_property(other_value, name='other')
|
|
|
|
# docstring should be preserved
|
|
self.assertEqual(A.value.__doc__, "Here is the docstring...")
|
|
|
|
a = A()
|
|
|
|
# check that it is cached
|
|
self.assertEqual(a.value, a.value)
|
|
|
|
# check that it returns the right thing
|
|
self.assertEqual(a.value[0], 1)
|
|
|
|
# check that state isn't shared between instances
|
|
a2 = A()
|
|
self.assertNotEqual(a.value, a2.value)
|
|
|
|
# check that it behaves like a property when there's no instance
|
|
self.assertIsInstance(A.value, cached_property)
|
|
|
|
# check that overriding name works
|
|
self.assertEqual(a.other, 1)
|
|
self.assertTrue(callable(a.other_value))
|
|
|
|
def test_lazy_equality(self):
|
|
"""
|
|
Tests that == and != work correctly for Promises.
|
|
"""
|
|
|
|
lazy_a = lazy(lambda: 4, int)
|
|
lazy_b = lazy(lambda: 4, int)
|
|
lazy_c = lazy(lambda: 5, int)
|
|
|
|
self.assertEqual(lazy_a(), lazy_b())
|
|
self.assertNotEqual(lazy_b(), lazy_c())
|