mirror of
https://github.com/django/django.git
synced 2024-12-23 17:46:27 +00:00
148 lines
4.3 KiB
Python
148 lines
4.3 KiB
Python
# -*- encoding: utf-8 -*-
|
|
from __future__ import unicode_literals
|
|
|
|
import unittest
|
|
|
|
from django.utils import six
|
|
from django.utils.functional import cached_property, 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.assertIn('base_method', dir(t))
|
|
|
|
def test_lazy_base_class_override(self):
|
|
"""Test that lazy finds the correct (overridden) method implementation"""
|
|
|
|
class Base(object):
|
|
def method(self):
|
|
return 'Base'
|
|
|
|
class Klazz(Base):
|
|
def method(self):
|
|
return 'Klazz'
|
|
|
|
t = lazy(lambda: Klazz(), Base)()
|
|
self.assertEqual(t.method(), 'Klazz')
|
|
|
|
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"
|
|
|
|
with self.assertRaises(NotImplementedError):
|
|
A().do
|
|
self.assertEqual(B().do, 'DO IT')
|
|
|
|
def test_lazy_object_to_string(self):
|
|
|
|
class Klazz(object):
|
|
if six.PY3:
|
|
def __str__(self):
|
|
return "Î am ā Ǩlâzz."
|
|
|
|
def __bytes__(self):
|
|
return b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz."
|
|
else:
|
|
def __unicode__(self):
|
|
return "Î am ā Ǩlâzz."
|
|
|
|
def __str__(self):
|
|
return b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz."
|
|
|
|
t = lazy(lambda: Klazz(), Klazz)()
|
|
self.assertEqual(six.text_type(t), "Î am ā Ǩlâzz.")
|
|
self.assertEqual(six.binary_type(t), b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz.")
|
|
|
|
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())
|
|
|
|
def test_lazy_repr_text(self):
|
|
original_object = 'Lazy translation text'
|
|
lazy_obj = lazy(lambda: original_object, six.text_type)
|
|
self.assertEquals(repr(original_object), repr(lazy_obj()))
|
|
|
|
def test_lazy_repr_int(self):
|
|
original_object = 15
|
|
lazy_obj = lazy(lambda: original_object, int)
|
|
self.assertEquals(repr(original_object), repr(lazy_obj()))
|
|
|
|
def test_lazy_repr_bytes(self):
|
|
original_object = b'J\xc3\xbcst a str\xc3\xadng'
|
|
lazy_obj = lazy(lambda: original_object, bytes)
|
|
self.assertEquals(repr(original_object), repr(lazy_obj()))
|