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276 lines
8.3 KiB
Python
276 lines
8.3 KiB
Python
from __future__ import unicode_literals
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import copy
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import pickle
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import sys
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from unittest import TestCase
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from django.utils import six
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from django.utils.functional import LazyObject, SimpleLazyObject, empty
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class Foo(object):
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"""
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A simple class with just one attribute.
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"""
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foo = 'bar'
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def __eq__(self, other):
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return self.foo == other.foo
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class LazyObjectTestCase(TestCase):
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def lazy_wrap(self, wrapped_object):
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"""
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Wrap the given object into a LazyObject
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"""
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class AdHocLazyObject(LazyObject):
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def _setup(self):
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self._wrapped = wrapped_object
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return AdHocLazyObject()
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def test_getattr(self):
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obj = self.lazy_wrap(Foo())
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self.assertEqual(obj.foo, 'bar')
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def test_setattr(self):
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obj = self.lazy_wrap(Foo())
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obj.foo = 'BAR'
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obj.bar = 'baz'
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self.assertEqual(obj.foo, 'BAR')
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self.assertEqual(obj.bar, 'baz')
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def test_setattr2(self):
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# Same as test_setattr but in reversed order
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obj = self.lazy_wrap(Foo())
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obj.bar = 'baz'
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obj.foo = 'BAR'
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self.assertEqual(obj.foo, 'BAR')
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self.assertEqual(obj.bar, 'baz')
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def test_delattr(self):
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obj = self.lazy_wrap(Foo())
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obj.bar = 'baz'
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self.assertEqual(obj.bar, 'baz')
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del obj.bar
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with self.assertRaises(AttributeError):
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obj.bar
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def test_cmp(self):
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obj1 = self.lazy_wrap('foo')
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obj2 = self.lazy_wrap('bar')
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obj3 = self.lazy_wrap('foo')
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self.assertEqual(obj1, 'foo')
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self.assertEqual(obj1, obj3)
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self.assertNotEqual(obj1, obj2)
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self.assertNotEqual(obj1, 'bar')
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def test_bytes(self):
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obj = self.lazy_wrap(b'foo')
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self.assertEqual(bytes(obj), b'foo')
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def test_text(self):
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obj = self.lazy_wrap('foo')
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self.assertEqual(six.text_type(obj), 'foo')
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def test_bool(self):
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# Refs #21840
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for f in [False, 0, (), {}, [], None, set()]:
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self.assertFalse(self.lazy_wrap(f))
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for t in [True, 1, (1,), {1: 2}, [1], object(), {1}]:
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self.assertTrue(t)
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def test_dir(self):
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obj = self.lazy_wrap('foo')
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self.assertEqual(dir(obj), dir('foo'))
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def test_len(self):
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for seq in ['asd', [1, 2, 3], {'a': 1, 'b': 2, 'c': 3}]:
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obj = self.lazy_wrap(seq)
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self.assertEqual(len(obj), 3)
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def test_class(self):
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self.assertIsInstance(self.lazy_wrap(42), int)
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class Bar(Foo):
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pass
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self.assertIsInstance(self.lazy_wrap(Bar()), Foo)
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def test_hash(self):
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obj = self.lazy_wrap('foo')
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d = {}
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d[obj] = 'bar'
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self.assertIn('foo', d)
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self.assertEqual(d['foo'], 'bar')
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def test_contains(self):
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test_data = [
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('c', 'abcde'),
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(2, [1, 2, 3]),
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('a', {'a': 1, 'b': 2, 'c': 3}),
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(2, {1, 2, 3}),
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]
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for needle, haystack in test_data:
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self.assertIn(needle, self.lazy_wrap(haystack))
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# __contains__ doesn't work when the haystack is a string and the needle a LazyObject
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for needle_haystack in test_data[1:]:
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self.assertIn(self.lazy_wrap(needle), haystack)
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self.assertIn(self.lazy_wrap(needle), self.lazy_wrap(haystack))
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def test_getitem(self):
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obj_list = self.lazy_wrap([1, 2, 3])
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obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
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self.assertEqual(obj_list[0], 1)
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self.assertEqual(obj_list[-1], 3)
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self.assertEqual(obj_list[1:2], [2])
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self.assertEqual(obj_dict['b'], 2)
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with self.assertRaises(IndexError):
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obj_list[3]
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with self.assertRaises(KeyError):
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obj_dict['f']
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def test_setitem(self):
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obj_list = self.lazy_wrap([1, 2, 3])
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obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
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obj_list[0] = 100
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self.assertEqual(obj_list, [100, 2, 3])
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obj_list[1:2] = [200, 300, 400]
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self.assertEqual(obj_list, [100, 200, 300, 400, 3])
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obj_dict['a'] = 100
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obj_dict['d'] = 400
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self.assertEqual(obj_dict, {'a': 100, 'b': 2, 'c': 3, 'd': 400})
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def test_delitem(self):
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obj_list = self.lazy_wrap([1, 2, 3])
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obj_dict = self.lazy_wrap({'a': 1, 'b': 2, 'c': 3})
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del obj_list[-1]
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del obj_dict['c']
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self.assertEqual(obj_list, [1, 2])
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self.assertEqual(obj_dict, {'a': 1, 'b': 2})
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with self.assertRaises(IndexError):
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del obj_list[3]
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with self.assertRaises(KeyError):
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del obj_dict['f']
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def test_iter(self):
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# LazyObjects don't actually implements __iter__ but you can still
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# iterate over them because they implement __getitem__
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obj = self.lazy_wrap([1, 2, 3])
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for expected, actual in zip([1, 2, 3], obj):
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self.assertEqual(expected, actual)
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def test_pickle(self):
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# See ticket #16563
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obj = self.lazy_wrap(Foo())
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pickled = pickle.dumps(obj)
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unpickled = pickle.loads(pickled)
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self.assertIsInstance(unpickled, Foo)
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self.assertEqual(unpickled, obj)
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self.assertEqual(unpickled.foo, obj.foo)
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def test_deepcopy(self):
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# Check that we *can* do deep copy, and that it returns the right
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# objects.
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l = [1, 2, 3]
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obj = self.lazy_wrap(l)
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len(l) # forces evaluation
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obj2 = copy.deepcopy(obj)
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self.assertIsInstance(obj2, list)
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self.assertEqual(obj2, [1, 2, 3])
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def test_deepcopy_no_evaluation(self):
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# copying doesn't force evaluation
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l = [1, 2, 3]
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obj = self.lazy_wrap(l)
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obj2 = copy.deepcopy(obj)
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# Copying shouldn't force evaluation
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self.assertIs(obj._wrapped, empty)
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self.assertIs(obj2._wrapped, empty)
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class SimpleLazyObjectTestCase(LazyObjectTestCase):
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# By inheriting from LazyObjectTestCase and redefining the lazy_wrap()
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# method which all testcases use, we get to make sure all behaviors
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# tested in the parent testcase also apply to SimpleLazyObject.
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def lazy_wrap(self, wrapped_object):
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return SimpleLazyObject(lambda: wrapped_object)
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def test_repr(self):
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# First, for an unevaluated SimpleLazyObject
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obj = self.lazy_wrap(42)
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# __repr__ contains __repr__ of setup function and does not evaluate
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# the SimpleLazyObject
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six.assertRegex(self, repr(obj), '^<SimpleLazyObject:')
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self.assertIs(obj._wrapped, empty) # make sure evaluation hasn't been triggered
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self.assertEqual(obj, 42) # evaluate the lazy object
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self.assertIsInstance(obj._wrapped, int)
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self.assertEqual(repr(obj), '<SimpleLazyObject: 42>')
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def test_trace(self):
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# See ticket #19456
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old_trace_func = sys.gettrace()
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try:
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def trace_func(frame, event, arg):
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frame.f_locals['self'].__class__
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if old_trace_func is not None:
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old_trace_func(frame, event, arg)
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sys.settrace(trace_func)
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self.lazy_wrap(None)
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finally:
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sys.settrace(old_trace_func)
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def test_none(self):
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i = [0]
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def f():
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i[0] += 1
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return None
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x = SimpleLazyObject(f)
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self.assertEqual(str(x), "None")
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self.assertEqual(i, [1])
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self.assertEqual(str(x), "None")
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self.assertEqual(i, [1])
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def test_dict(self):
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# See ticket #18447
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lazydict = SimpleLazyObject(lambda: {'one': 1})
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self.assertEqual(lazydict['one'], 1)
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lazydict['one'] = -1
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self.assertEqual(lazydict['one'], -1)
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self.assertTrue('one' in lazydict)
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self.assertFalse('two' in lazydict)
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self.assertEqual(len(lazydict), 1)
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del lazydict['one']
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with self.assertRaises(KeyError):
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lazydict['one']
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def test_list_set(self):
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lazy_list = SimpleLazyObject(lambda: [1, 2, 3, 4, 5])
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lazy_set = SimpleLazyObject(lambda: set([1, 2, 3, 4]))
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self.assertTrue(1 in lazy_list)
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self.assertTrue(1 in lazy_set)
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self.assertFalse(6 in lazy_list)
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self.assertFalse(6 in lazy_set)
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self.assertEqual(len(lazy_list), 5)
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self.assertEqual(len(lazy_set), 4)
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