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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 LazyObject, SimpleLazyObject, empty
class Foo(object):
"""
A simple class with just one attribute.
"""
foo = 'bar'
def __eq__(self, other):
return self.foo == other.foo
class LazyObjectTestCase(TestCase):
def lazy_wrap(self, wrapped_object):
"""
Wrap the given object into a LazyObject
"""
class AdHocLazyObject(LazyObject):
def _setup(self):
self._wrapped = wrapped_object
return AdHocLazyObject()
def test_getattr(self):
obj = self.lazy_wrap(Foo())
self.assertEqual(obj.foo, 'bar')
def test_setattr(self):
obj = self.lazy_wrap(Foo())
obj.foo = 'BAR'
obj.bar = 'baz'
self.assertEqual(obj.foo, 'BAR')
self.assertEqual(obj.bar, 'baz')
def test_setattr2(self):
# Same as test_setattr but in reversed order
obj = self.lazy_wrap(Foo())
obj.bar = 'baz'
obj.foo = 'BAR'
self.assertEqual(obj.foo, 'BAR')
self.assertEqual(obj.bar, 'baz')
def test_delattr(self):
obj = self.lazy_wrap(Foo())
obj.bar = 'baz'
self.assertEqual(obj.bar, 'baz')
del obj.bar
with self.assertRaises(AttributeError):
obj.bar
def test_cmp(self):
obj1 = self.lazy_wrap('foo')
obj2 = self.lazy_wrap('bar')
obj3 = self.lazy_wrap('foo')
self.assertEqual(obj1, 'foo')
self.assertEqual(obj1, obj3)
self.assertNotEqual(obj1, obj2)
self.assertNotEqual(obj1, 'bar')
def test_bytes(self):
obj = self.lazy_wrap(b'foo')
self.assertEqual(bytes(obj), b'foo')
def test_text(self):
obj = self.lazy_wrap('foo')
self.assertEqual(six.text_type(obj), 'foo')
def test_bool(self):
# Refs #21840
for f in [False, 0, (), {}, [], None, set()]:
self.assertFalse(self.lazy_wrap(f))
for t in [True, 1, (1,), {1: 2}, [1], object(), {1}]:
self.assertTrue(t)
def test_dir(self):
obj = self.lazy_wrap('foo')
self.assertEqual(dir(obj), dir('foo'))
def test_len(self):
for seq in ['asd', [1, 2, 3], {'a': 1, 'b': 2, 'c': 3}]:
obj = self.lazy_wrap(seq)
self.assertEqual(len(obj), 3)
def test_class(self):
self.assertIsInstance(self.lazy_wrap(42), int)
class Bar(Foo):
pass
self.assertIsInstance(self.lazy_wrap(Bar()), Foo)
def test_hash(self):
obj = self.lazy_wrap('foo')
d = {}
d[obj] = 'bar'
self.assertIn('foo', d)
self.assertEqual(d['foo'], 'bar')
def test_contains(self):
test_data = [
('c', 'abcde'),
(2, [1, 2, 3]),
('a', {'a': 1, 'b': 2, 'c': 3}),
(2, {1, 2, 3}),
]
for needle, haystack in test_data:
self.assertIn(needle, self.lazy_wrap(haystack))
# __contains__ doesn't work when the haystack is a string and the needle a LazyObject
for needle_haystack in test_data[1:]:
self.assertIn(self.lazy_wrap(needle), haystack)
self.assertIn(self.lazy_wrap(needle), self.lazy_wrap(haystack))
def test_getitem(self):
obj_list = self.lazy_wrap([1, 2, 3])
obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
self.assertEqual(obj_list[0], 1)
self.assertEqual(obj_list[-1], 3)
self.assertEqual(obj_list[1:2], [2])
self.assertEqual(obj_dict['b'], 2)
with self.assertRaises(IndexError):
obj_list[3]
with self.assertRaises(KeyError):
obj_dict['f']
def test_setitem(self):
obj_list = self.lazy_wrap([1, 2, 3])
obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
obj_list[0] = 100
self.assertEqual(obj_list, [100, 2, 3])
obj_list[1:2] = [200, 300, 400]
self.assertEqual(obj_list, [100, 200, 300, 400, 3])
obj_dict['a'] = 100
obj_dict['d'] = 400
self.assertEqual(obj_dict, {'a': 100, 'b': 2, 'c': 3, 'd': 400})
def test_delitem(self):
obj_list = self.lazy_wrap([1, 2, 3])
obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
del obj_list[-1]
del obj_dict['c']
self.assertEqual(obj_list, [1, 2])
self.assertEqual(obj_dict, {'a': 1, 'b': 2})
with self.assertRaises(IndexError):
del obj_list[3]
with self.assertRaises(KeyError):
del obj_dict['f']
def test_iter(self):
# LazyObjects don't actually implements __iter__ but you can still
# iterate over them because they implement __getitem__
obj = self.lazy_wrap([1, 2, 3])
for expected, actual in zip([1, 2, 3], obj):
self.assertEqual(expected, actual)
def test_pickle(self):
# See ticket #16563
obj = self.lazy_wrap(Foo())
pickled = pickle.dumps(obj)
unpickled = pickle.loads(pickled)
self.assertIsInstance(unpickled, Foo)
self.assertEqual(unpickled, obj)
self.assertEqual(unpickled.foo, obj.foo)
def test_deepcopy(self):
# Check that we *can* do deep copy, and that it returns the right
# objects.
l = [1, 2, 3]
obj = self.lazy_wrap(l)
len(l) # forces evaluation
obj2 = copy.deepcopy(obj)
self.assertIsInstance(obj2, list)
self.assertEqual(obj2, [1, 2, 3])
def test_deepcopy_no_evaluation(self):
# copying doesn't force evaluation
l = [1, 2, 3]
obj = self.lazy_wrap(l)
obj2 = copy.deepcopy(obj)
# Copying shouldn't force evaluation
self.assertIs(obj._wrapped, empty)
self.assertIs(obj2._wrapped, empty)
class SimpleLazyObjectTestCase(LazyObjectTestCase):
# By inheriting from LazyObjectTestCase and redefining the lazy_wrap()
# method which all testcases use, we get to make sure all behaviors
# tested in the parent testcase also apply to SimpleLazyObject.
def lazy_wrap(self, wrapped_object):
return SimpleLazyObject(lambda: wrapped_object)
def test_repr(self):
# First, for an unevaluated SimpleLazyObject
obj = self.lazy_wrap(42)
# __repr__ contains __repr__ of setup function and does not evaluate
# the SimpleLazyObject
six.assertRegex(self, repr(obj), '^<SimpleLazyObject:')
self.assertIs(obj._wrapped, empty) # make sure evaluation hasn't been triggered
self.assertEqual(obj, 42) # evaluate the lazy object
self.assertIsInstance(obj._wrapped, int)
self.assertEqual(repr(obj), '<SimpleLazyObject: 42>')
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)
self.lazy_wrap(None)
finally:
sys.settrace(old_trace_func)
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_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_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)
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