django1/tests/regressiontests/utils/simplelazyobject.py

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import copy
from django.utils.unittest import TestCase
from django.utils.functional import SimpleLazyObject, empty
class _ComplexObject(object):
def __init__(self, name):
self.name = name
def __eq__(self, other):
return self.name == other.name
def __hash__(self):
return hash(self.name)
def __str__(self):
return "I am _ComplexObject(%r)" % self.name
def __unicode__(self):
return unicode(self.name)
def __repr__(self):
return "_ComplexObject(%r)" % self.name
complex_object = lambda: _ComplexObject("joe")
class TestUtilsSimpleLazyObject(TestCase):
"""
Tests for SimpleLazyObject
"""
# Note that concrete use cases for SimpleLazyObject are also found in the
# auth context processor tests (unless the implementation of that function
# is changed).
def test_equality(self):
self.assertEqual(complex_object(), SimpleLazyObject(complex_object))
self.assertEqual(SimpleLazyObject(complex_object), complex_object())
def test_hash(self):
# hash() equality would not be true for many objects, but it should be
# for _ComplexObject
self.assertEqual(hash(complex_object()),
hash(SimpleLazyObject(complex_object)))
def test_repr(self):
# For debugging, it will really confuse things if there is no clue that
# SimpleLazyObject is actually a proxy object. So we don't
# proxy __repr__
self.assertTrue("SimpleLazyObject" in repr(SimpleLazyObject(complex_object)))
def test_str(self):
self.assertEqual("I am _ComplexObject('joe')", str(SimpleLazyObject(complex_object)))
def test_unicode(self):
self.assertEqual(u"joe", unicode(SimpleLazyObject(complex_object)))
def test_class(self):
# This is important for classes that use __class__ in things like
# equality tests.
self.assertEqual(_ComplexObject, SimpleLazyObject(complex_object).__class__)
def test_deepcopy(self):
# Check that we *can* do deep copy, and that it returns the right
# objects.
# First, for an unevaluated SimpleLazyObject
s = SimpleLazyObject(complex_object)
self.assertIs(s._wrapped, empty)
s2 = copy.deepcopy(s)
# something has gone wrong is s is evaluated
self.assertIs(s._wrapped, empty)
self.assertEqual(s2, complex_object())
# Second, for an evaluated SimpleLazyObject
name = s.name # evaluate
self.assertIsNot(s._wrapped, empty)
s3 = copy.deepcopy(s)
self.assertEqual(s3, complex_object())
def test_none(self):
i = [0]
def f():
i[0] += 1
return None
x = SimpleLazyObject(f)
self.assertEqual(str(x), "None")
self.assertEqual(i, [1])
self.assertEqual(str(x), "None")
self.assertEqual(i, [1])
def test_bool(self):
x = SimpleLazyObject(lambda: 3)
self.assertTrue(x)
x = SimpleLazyObject(lambda: 0)
self.assertFalse(x)