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155 lines
4.8 KiB
Python
155 lines
4.8 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 django.utils import six
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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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if six.PY3:
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def __bytes__(self):
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return ("I am _ComplexObject(%r)" % self.name).encode("utf-8")
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def __str__(self):
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return self.name
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else:
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def __str__(self):
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return b"I am _ComplexObject(%r)" % str(self.name)
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def __unicode__(self):
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return 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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# First, for an unevaluated SimpleLazyObject
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x = SimpleLazyObject(complex_object)
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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.assertEqual("<SimpleLazyObject: %r>" % complex_object, repr(x))
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self.assertEqual(empty, x._wrapped)
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# Second, for an evaluated SimpleLazyObject
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name = x.name # evaluate
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self.assertTrue(isinstance(x._wrapped, _ComplexObject))
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# __repr__ contains __repr__ of wrapped object
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self.assertEqual("<SimpleLazyObject: %r>" % x._wrapped, repr(x))
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def test_bytes(self):
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self.assertEqual(b"I am _ComplexObject('joe')",
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bytes(SimpleLazyObject(complex_object)))
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def test_text(self):
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self.assertEqual("joe", six.text_type(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(six.text_type(unpickled), six.text_type(x))
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self.assertEqual(unpickled.name, x.name)
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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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del lazydict['one']
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with self.assertRaises(KeyError):
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lazydict['one']
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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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SimpleLazyObject(None)
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finally:
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sys.settrace(old_trace_func)
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