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# -*- 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"
self.assertRaises(NotImplementedError, lambda: 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())
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