1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
from __future__ import unicode_literals
import copy
import pickle
import sys
from unittest import TestCase
from django.utils import six
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)
if six.PY3:
def __bytes__(self):
return ("I am _ComplexObject(%r)" % self.name).encode("utf-8")
def __str__(self):
return self.name
else:
def __str__(self):
return b"I am _ComplexObject(%r)" % str(self.name)
def __unicode__(self):
return 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):
# First, for an unevaluated SimpleLazyObject
x = SimpleLazyObject(complex_object)
# __repr__ contains __repr__ of setup function and does not evaluate
# the SimpleLazyObject
self.assertEqual("<SimpleLazyObject: %r>" % complex_object, repr(x))
self.assertEqual(empty, x._wrapped)
# Second, for an evaluated SimpleLazyObject
name = x.name # evaluate
self.assertIsInstance(x._wrapped, _ComplexObject)
# __repr__ contains __repr__ of wrapped object
self.assertEqual("<SimpleLazyObject: %r>" % x._wrapped, repr(x))
def test_bytes(self):
self.assertEqual(b"I am _ComplexObject('joe')",
bytes(SimpleLazyObject(complex_object)))
def test_text(self):
self.assertEqual("joe", six.text_type(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)
def test_pickle_complex(self):
# See ticket #16563
x = SimpleLazyObject(complex_object)
pickled = pickle.dumps(x)
unpickled = pickle.loads(pickled)
self.assertEqual(unpickled, x)
self.assertEqual(six.text_type(unpickled), six.text_type(x))
self.assertEqual(unpickled.name, x.name)
def test_dict(self):
# See ticket #18447
lazydict = SimpleLazyObject(lambda: {'one': 1})
self.assertEqual(lazydict['one'], 1)
lazydict['one'] = -1
self.assertEqual(lazydict['one'], -1)
self.assertTrue('one' in lazydict)
self.assertFalse('two' in lazydict)
self.assertEqual(len(lazydict), 1)
del lazydict['one']
with self.assertRaises(KeyError):
lazydict['one']
def test_trace(self):
# See ticket #19456
old_trace_func = sys.gettrace()
try:
def trace_func(frame, event, arg):
frame.f_locals['self'].__class__
if old_trace_func is not None:
old_trace_func(frame, event, arg)
sys.settrace(trace_func)
SimpleLazyObject(None)
finally:
sys.settrace(old_trace_func)
def test_not_equal(self):
lazy1 = SimpleLazyObject(lambda: 2)
lazy2 = SimpleLazyObject(lambda: 2)
lazy3 = SimpleLazyObject(lambda: 3)
self.assertEqual(lazy1, lazy2)
self.assertNotEqual(lazy1, lazy3)
self.assertTrue(lazy1 != lazy3)
self.assertFalse(lazy1 != lazy2)
def test_pickle_py2_regression(self):
from django.contrib.auth.models import User
# See ticket #20212
user = User.objects.create_user('johndoe', 'john@example.com', 'pass')
x = SimpleLazyObject(lambda: user)
# This would fail with "TypeError: can't pickle instancemethod objects",
# only on Python 2.X.
pickled = pickle.dumps(x)
# Try the variant protocol levels.
pickled = pickle.dumps(x, 0)
pickled = pickle.dumps(x, 1)
pickled = pickle.dumps(x, 2)
if six.PY2:
import cPickle
# This would fail with "TypeError: expected string or Unicode object, NoneType found".
pickled = cPickle.dumps(x)
def test_list_set(self):
lazy_list = SimpleLazyObject(lambda: [1, 2, 3, 4, 5])
lazy_set = SimpleLazyObject(lambda: set([1, 2, 3, 4]))
self.assertTrue(1 in lazy_list)
self.assertTrue(1 in lazy_set)
self.assertFalse(6 in lazy_list)
self.assertFalse(6 in lazy_set)
self.assertEqual(len(lazy_list), 5)
self.assertEqual(len(lazy_set), 4)
|
