--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/regressiontests/utils/simplelazyobject.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,77 @@
+import unittest
+
+import django.utils.copycompat as copy
+from django.utils.functional import SimpleLazyObject
+
+class _ComplexObject(object):
+    def __init__(self, name):
+        self.name = name
+
+    def __eq__(self, other):
+        return self.name == other.name
+
+    def __hash__(self):
+        return hash(self.name)
+
+    def __str__(self):
+        return "I am _ComplexObject(%r)" % self.name
+
+    def __unicode__(self):
+        return unicode(self.name)
+
+    def __repr__(self):
+        return "_ComplexObject(%r)" % self.name
+
+complex_object = lambda: _ComplexObject("joe")
+
+class TestUtilsSimpleLazyObject(unittest.TestCase):
+    """
+    Tests for SimpleLazyObject
+    """
+    # Note that concrete use cases for SimpleLazyObject are also found in the
+    # auth context processor tests (unless the implementation of that function
+    # is changed).
+
+    def test_equality(self):
+        self.assertEqual(complex_object(), SimpleLazyObject(complex_object))
+        self.assertEqual(SimpleLazyObject(complex_object), complex_object())
+
+    def test_hash(self):
+        # hash() equality would not be true for many objects, but it should be
+        # for _ComplexObject
+        self.assertEqual(hash(complex_object()),
+                         hash(SimpleLazyObject(complex_object)))
+
+    def test_repr(self):
+        # For debugging, it will really confuse things if there is no clue that
+        # SimpleLazyObject is actually a proxy object. So we don't
+        # proxy __repr__
+        self.assert_("SimpleLazyObject" in repr(SimpleLazyObject(complex_object)))
+
+    def test_str(self):
+        self.assertEqual("I am _ComplexObject('joe')", str(SimpleLazyObject(complex_object)))
+
+    def test_unicode(self):
+        self.assertEqual(u"joe", unicode(SimpleLazyObject(complex_object)))
+
+    def test_class(self):
+        # This is important for classes that use __class__ in things like
+        # equality tests.
+        self.assertEqual(_ComplexObject, SimpleLazyObject(complex_object).__class__)
+
+    def test_deepcopy(self):
+        # Check that we *can* do deep copy, and that it returns the right
+        # objects.
+
+        # First, for an unevaluated SimpleLazyObject
+        s = SimpleLazyObject(complex_object)
+        assert s._wrapped is None
+        s2 = copy.deepcopy(s)
+        assert s._wrapped is None # something has gone wrong is s is evaluated
+        self.assertEqual(s2, complex_object())
+
+        # Second, for an evaluated SimpleLazyObject
+        name = s.name # evaluate
+        assert s._wrapped is not None
+        s3 = copy.deepcopy(s)
+        self.assertEqual(s3, complex_object())