109 lines
3.4 KiB
Python
109 lines
3.4 KiB
Python
import copy
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import pickle
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from django.utils.unittest import TestCase
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from django.utils.functional import SimpleLazyObject, empty
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class _ComplexObject(object):
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def __init__(self, name):
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self.name = name
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def __eq__(self, other):
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return self.name == other.name
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def __hash__(self):
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return hash(self.name)
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def __str__(self):
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return "I am _ComplexObject(%r)" % self.name
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def __unicode__(self):
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return unicode(self.name)
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def __repr__(self):
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return "_ComplexObject(%r)" % self.name
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complex_object = lambda: _ComplexObject("joe")
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class TestUtilsSimpleLazyObject(TestCase):
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"""
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Tests for SimpleLazyObject
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"""
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# Note that concrete use cases for SimpleLazyObject are also found in the
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# auth context processor tests (unless the implementation of that function
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# is changed).
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def test_equality(self):
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self.assertEqual(complex_object(), SimpleLazyObject(complex_object))
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self.assertEqual(SimpleLazyObject(complex_object), complex_object())
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def test_hash(self):
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# hash() equality would not be true for many objects, but it should be
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# for _ComplexObject
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self.assertEqual(hash(complex_object()),
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hash(SimpleLazyObject(complex_object)))
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def test_repr(self):
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# For debugging, it will really confuse things if there is no clue that
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# SimpleLazyObject is actually a proxy object. So we don't
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# proxy __repr__
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self.assertTrue("SimpleLazyObject" in repr(SimpleLazyObject(complex_object)))
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def test_str(self):
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self.assertEqual("I am _ComplexObject('joe')", str(SimpleLazyObject(complex_object)))
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def test_unicode(self):
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self.assertEqual(u"joe", unicode(SimpleLazyObject(complex_object)))
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def test_class(self):
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# This is important for classes that use __class__ in things like
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# equality tests.
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self.assertEqual(_ComplexObject, SimpleLazyObject(complex_object).__class__)
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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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# First, for an unevaluated SimpleLazyObject
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s = SimpleLazyObject(complex_object)
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self.assertIs(s._wrapped, empty)
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s2 = copy.deepcopy(s)
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# something has gone wrong is s is evaluated
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self.assertIs(s._wrapped, empty)
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self.assertEqual(s2, complex_object())
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# Second, for an evaluated SimpleLazyObject
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name = s.name # evaluate
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self.assertIsNot(s._wrapped, empty)
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s3 = copy.deepcopy(s)
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self.assertEqual(s3, complex_object())
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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_bool(self):
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x = SimpleLazyObject(lambda: 3)
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self.assertTrue(x)
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x = SimpleLazyObject(lambda: 0)
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self.assertFalse(x)
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def test_pickle_complex(self):
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# See ticket #16563
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x = SimpleLazyObject(complex_object)
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pickled = pickle.dumps(x)
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unpickled = pickle.loads(pickled)
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self.assertEqual(unpickled, x)
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self.assertEqual(unicode(unpickled), unicode(x))
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self.assertEqual(unpickled.name, x.name)
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