1 files changed, 123 insertions, 0 deletions
diff --git a/tests/utils/simplelazyobject.py b/tests/utils/simplelazyobject.py
new file mode 100644
index 0000000000..3f81e8f608
--- /dev/null
+++ b/tests/utils/simplelazyobject.py
@@ -0,0 +1,123 @@
+from __future__ import unicode_literals
+
+import copy
+import pickle
+
+from django.test.utils import str_prefix
+from django.utils import six
+from django.utils.unittest import TestCase
+from django.utils.functional import SimpleLazyObject, empty
+
+
+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)
+
+    if six.PY3:
+        def __bytes__(self):
+            return ("I am _ComplexObject(%r)" % self.name).encode("utf-8")
+
+        def __str__(self):
+            return self.name
+
+    else:
+        def __str__(self):
+            return b"I am _ComplexObject(%r)" % str(self.name)
+
+        def __unicode__(self):
+            return 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.assertTrue("SimpleLazyObject" in repr(SimpleLazyObject(complex_object)))
+
+    def test_bytes(self):
+        self.assertEqual(b"I am _ComplexObject('joe')",
+                bytes(SimpleLazyObject(complex_object)))
+
+    def test_text(self):
+        self.assertEqual("joe", six.text_type(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)
+        self.assertIs(s._wrapped, empty)
+        s2 = copy.deepcopy(s)
+        # something has gone wrong is s is evaluated
+        self.assertIs(s._wrapped, empty)
+        self.assertEqual(s2, complex_object())
+
+        # Second, for an evaluated SimpleLazyObject
+        name = s.name # evaluate
+        self.assertIsNot(s._wrapped, empty)
+        s3 = copy.deepcopy(s)
+        self.assertEqual(s3, complex_object())
+
+
+    def test_none(self):
+        i = [0]
+        def f():
+            i[0] += 1
+            return None
+
+        x = SimpleLazyObject(f)
+        self.assertEqual(str(x), "None")
+        self.assertEqual(i, [1])
+        self.assertEqual(str(x), "None")
+        self.assertEqual(i, [1])
+
+    def test_bool(self):
+        x = SimpleLazyObject(lambda: 3)
+        self.assertTrue(x)
+        x = SimpleLazyObject(lambda: 0)
+        self.assertFalse(x)
+
+    def test_pickle_complex(self):
+        # See ticket #16563
+        x = SimpleLazyObject(complex_object)
+        pickled = pickle.dumps(x)
+        unpickled = pickle.loads(pickled)
+        self.assertEqual(unpickled, x)
+        self.assertEqual(six.text_type(unpickled), six.text_type(x))
+        self.assertEqual(unpickled.name, x.name)