[soc2009/multidb] Merged up to trunk r11756.

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/multidb@11758 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/tests.py

@@ -5,6 +5,7 @@ Tests for django.utils.
 from unittest import TestCase
 
 from django.utils import html, checksums
+from django.utils.functional import SimpleLazyObject
 
 import timesince
 import datastructures
@@ -23,10 +24,11 @@ except NameError:
 __test__ = {
     'timesince': timesince,
     'datastructures': datastructures,
-    'dateformat': dateformat,
     'itercompat': itercompat,
 }
 
+from dateformat import *
+
 class TestUtilsHtml(TestCase):
 
     def check_output(self, function, value, output=None):
@@ -161,6 +163,80 @@ class TestUtilsChecksums(TestCase):
         for value, output in items:
             self.check_output(f, value, output)
 
+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(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):
+        import copy
+        # 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())
+
 if __name__ == "__main__":
     import doctest
     doctest.testmod()