diff -r 5ff1fc726848 -r c6bca38c1cbf parts/django/tests/regressiontests/expressions_regress/tests.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/regressiontests/expressions_regress/tests.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,195 @@
+"""
+Spanning tests for all the operations that F() expressions can perform.
+"""
+from django.test import TestCase, Approximate
+
+from django.conf import settings
+from django.db import models, DEFAULT_DB_ALIAS
+from django.db.models import F
+
+from regressiontests.expressions_regress.models import Number
+
+class ExpressionsRegressTests(TestCase):
+
+    def setUp(self):
+        Number(integer=-1).save()
+        Number(integer=42).save()
+        Number(integer=1337).save()
+        self.assertEqual(Number.objects.update(float=F('integer')), 3)
+
+    def test_fill_with_value_from_same_object(self):
+        """
+        We can fill a value in all objects with an other value of the
+        same object.
+        """
+        self.assertQuerysetEqual(
+                Number.objects.all(),
+                [
+                    '<Number: -1, -1.000>',
+                    '<Number: 42, 42.000>',
+                    '<Number: 1337, 1337.000>'
+                ]
+        )
+
+    def test_increment_value(self):
+        """
+        We can increment a value of all objects in a query set.
+        """
+        self.assertEqual(
+            Number.objects.filter(integer__gt=0)
+                  .update(integer=F('integer') + 1),
+            2)
+
+        self.assertQuerysetEqual(
+                Number.objects.all(),
+                [
+                    '<Number: -1, -1.000>',
+                    '<Number: 43, 42.000>',
+                    '<Number: 1338, 1337.000>'
+                ]
+        )
+
+    def test_filter_not_equals_other_field(self):
+        """
+        We can filter for objects, where a value is not equals the value
+        of an other field.
+        """
+        self.assertEqual(
+            Number.objects.filter(integer__gt=0)
+                  .update(integer=F('integer') + 1),
+            2)
+        self.assertQuerysetEqual(
+                Number.objects.exclude(float=F('integer')),
+                [
+                    '<Number: 43, 42.000>',
+                    '<Number: 1338, 1337.000>'
+                ]
+        )
+
+    def test_complex_expressions(self):
+        """
+        Complex expressions of different connection types are possible.
+        """
+        n = Number.objects.create(integer=10, float=123.45)
+        self.assertEqual(Number.objects.filter(pk=n.pk)
+                                .update(float=F('integer') + F('float') * 2),
+                          1)
+
+        self.assertEqual(Number.objects.get(pk=n.pk).integer, 10)
+        self.assertEqual(Number.objects.get(pk=n.pk).float, Approximate(256.900, places=3))
+
+class ExpressionOperatorTests(TestCase):
+    def setUp(self):
+        self.n = Number.objects.create(integer=42, float=15.5)
+
+    def test_lefthand_addition(self):
+        # LH Addition of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(
+            integer=F('integer') + 15,
+            float=F('float') + 42.7
+        )
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3))
+
+    def test_lefthand_subtraction(self):
+        # LH Subtraction of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(integer=F('integer') - 15,
+                                              float=F('float') - 42.7)
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(-27.200, places=3))
+
+    def test_lefthand_multiplication(self):
+        # Multiplication of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(integer=F('integer') * 15,
+                                              float=F('float') * 42.7)
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3))
+
+    def test_lefthand_division(self):
+        # LH Division of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(integer=F('integer') / 2,
+                                              float=F('float') / 42.7)
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 21)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(0.363, places=3))
+
+    def test_lefthand_modulo(self):
+        # LH Modulo arithmetic on integers
+        Number.objects.filter(pk=self.n.pk).update(integer=F('integer') % 20)
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 2)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+
+    def test_lefthand_bitwise_and(self):
+        # LH Bitwise ands on integers
+        Number.objects.filter(pk=self.n.pk).update(integer=F('integer') & 56)
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 40)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+
+    if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.oracle':
+        def test_lefthand_bitwise_or(self):
+            # LH Bitwise or on integers
+            Number.objects.filter(pk=self.n.pk).update(integer=F('integer') | 48)
+
+            self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 58)
+            self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+
+    def test_right_hand_addition(self):
+        # Right hand operators
+        Number.objects.filter(pk=self.n.pk).update(integer=15 + F('integer'),
+                                              float=42.7 + F('float'))
+
+        # RH Addition of floats and integers
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3))
+
+    def test_right_hand_subtraction(self):
+        Number.objects.filter(pk=self.n.pk).update(integer=15 - F('integer'),
+                                              float=42.7 - F('float'))
+
+        # RH Subtraction of floats and integers
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, -27)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(27.200, places=3))
+
+    def test_right_hand_multiplication(self):
+        # RH Multiplication of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(integer=15 * F('integer'),
+                                              float=42.7 * F('float'))
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3))
+
+    def test_right_hand_division(self):
+        # RH Division of floats and integers
+        Number.objects.filter(pk=self.n.pk).update(integer=640 / F('integer'),
+                                              float=42.7 / F('float'))
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 15)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(2.755, places=3))
+
+    def test_right_hand_modulo(self):
+        # RH Modulo arithmetic on integers
+        Number.objects.filter(pk=self.n.pk).update(integer=69 % F('integer'))
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+
+    def test_right_hand_bitwise_and(self):
+        # RH Bitwise ands on integers
+        Number.objects.filter(pk=self.n.pk).update(integer=15 & F('integer'))
+
+        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 10)
+        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+
+    if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.oracle':
+        def test_right_hand_bitwise_or(self):
+            # RH Bitwise or on integers
+            Number.objects.filter(pk=self.n.pk).update(integer=15 | F('integer'))
+
+            self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 47)
+            self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3))
+