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Fixed #21840 -- Moved dunder methods from SimpleLazyObject to LazyObject.
This commit also added tests for LazyObject and refactored the testsuite of SimpleLazyObject so that it can share test cases with LazyObject.
This commit is contained in:
Baptiste Mispelon
parent
4b4c704517
commit
61917aa08b
3 changed files with 340 additions and 227 deletions
275
tests/utils_tests/test_lazyobject.py
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275
tests/utils_tests/test_lazyobject.py
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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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self.assertRegexpMatches(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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