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diff --git a/tests/regressiontests/expressions_regress/__init__.py b/tests/regressiontests/expressions_regress/__init__.py
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+++ b/tests/regressiontests/expressions_regress/__init__.py
diff --git a/tests/regressiontests/expressions_regress/models.py b/tests/regressiontests/expressions_regress/models.py
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+"""
+Spanning tests for all the operations that F() expressions can perform.
+"""
+
+from django.db import models
+
+#
+# Model for testing arithmetic expressions.
+#
+
+class Number(models.Model):
+    integer = models.IntegerField()
+    float = models.FloatField(null=True)
+
+    def __unicode__(self):
+        return u'%i, %.3f' % (self.integer, self.float)
+
+
+__test__ = {'API_TESTS': """
+>>> from django.db.models import F
+
+>>> Number(integer=-1).save()
+>>> Number(integer=42).save()
+>>> Number(integer=1337).save()
+
+We can fill a value in all objects with an other value of the same object.
+
+>>> Number.objects.update(float=F('integer'))
+3
+>>> Number.objects.all()
+[<Number: -1, -1.000>, <Number: 42, 42.000>, <Number: 1337, 1337.000>]
+
+We can increment a value of all objects in a query set.
+
+>>> Number.objects.filter(integer__gt=0).update(integer=F('integer') + 1)
+2
+>>> Number.objects.all()
+[<Number: -1, -1.000>, <Number: 43, 42.000>, <Number: 1338, 1337.000>]
+
+We can filter for objects, where a value is not equals the value of an other field.
+
+>>> Number.objects.exclude(float=F('integer'))
+[<Number: 43, 42.000>, <Number: 1338, 1337.000>]
+
+Complex expressions of different connection types are possible.
+
+>>> n = Number.objects.create(integer=10, float=123.45)
+
+>>> Number.objects.filter(pk=n.pk).update(float=F('integer') + F('float') * 2)
+1
+>>> Number.objects.get(pk=n.pk)
+<Number: 10, 256.900>
+
+# All supported operators work as expected.
+
+>>> n = Number.objects.create(integer=42, float=15.5)
+
+# Left hand operators
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') + 15, float=F('float') + 42.7)
+>>> Number.objects.get(pk=n.pk) # LH Addition of floats and integers
+<Number: 57, 58.200>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') - 15, float=F('float') - 42.7)
+>>> Number.objects.get(pk=n.pk) # LH Subtraction of floats and integers
+<Number: 27, -27.200>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') * 15, float=F('float') * 42.7)
+>>> Number.objects.get(pk=n.pk) # Multiplication of floats and integers
+<Number: 630, 661.850>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') / 2, float=F('float') / 42.7)
+>>> Number.objects.get(pk=n.pk) # LH Division of floats and integers
+<Number: 21, 0.363>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') % 20)
+>>> Number.objects.get(pk=n.pk) # LH Modulo arithmetic on integers
+<Number: 2, 15.500>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') & 56)
+>>> Number.objects.get(pk=n.pk) # LH Bitwise ands on integers
+<Number: 40, 15.500>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=F('integer') | 48)
+>>> Number.objects.get(pk=n.pk) # LH Bitwise or on integers
+<Number: 58, 15.500>
+
+# Right hand operators
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=15 + F('integer'), float=42.7 + F('float'))
+>>> Number.objects.get(pk=n.pk) # RH Addition of floats and integers
+<Number: 57, 58.200>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=15 - F('integer'), float=42.7 - F('float'))
+>>> Number.objects.get(pk=n.pk) # RH Subtraction of floats and integers
+<Number: -27, 27.200>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=15 * F('integer'), float=42.7 * F('float'))
+>>> Number.objects.get(pk=n.pk) # RH Multiplication of floats and integers
+<Number: 630, 661.850>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=640 / F('integer'), float=42.7 / F('float'))
+>>> Number.objects.get(pk=n.pk) # RH Division of floats and integers
+<Number: 15, 2.755>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=69 % F('integer'))
+>>> Number.objects.get(pk=n.pk) # RH Modulo arithmetic on integers
+<Number: 27, 15.500>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=15 & F('integer'))
+>>> Number.objects.get(pk=n.pk) # RH Bitwise ands on integers
+<Number: 10, 15.500>
+
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=42, float=15.5)
+>>> _ = Number.objects.filter(pk=n.pk).update(integer=15 | F('integer'))
+>>> Number.objects.get(pk=n.pk) # RH Bitwise or on integers
+<Number: 47, 15.500>
+
+
+"""}