[1.2.X] Migrated null_queries doctests. Thanks to Stephan Jaekel.

Backport of r13932 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13940 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/null_queries/models.py

@@ -23,60 +23,3 @@ class OuterB(models.Model):
 class Inner(models.Model):
     first = models.ForeignKey(OuterA)
     second = models.ForeignKey(OuterB, null=True)
-
-__test__ = {'API_TESTS':"""
-# Regression test for the use of None as a query value. None is interpreted as
-# an SQL NULL, but only in __exact queries.
-# Set up some initial polls and choices
->>> p1 = Poll(question='Why?')
->>> p1.save()
->>> c1 = Choice(poll=p1, choice='Because.')
->>> c1.save()
->>> c2 = Choice(poll=p1, choice='Why Not?')
->>> c2.save()
-
-# Exact query with value None returns nothing ("is NULL" in sql, but every 'id'
-# field has a value).
->>> Choice.objects.filter(choice__exact=None)
-[]
-
-Excluding the previous result returns everything.
->>> Choice.objects.exclude(choice=None).order_by('id')
-[<Choice: Choice: Because. in poll Q: Why? >, <Choice: Choice: Why Not? in poll Q: Why? >]
-
-# Valid query, but fails because foo isn't a keyword
->>> Choice.objects.filter(foo__exact=None)
-Traceback (most recent call last):
-...
-FieldError: Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll
-
-# Can't use None on anything other than __exact
->>> Choice.objects.filter(id__gt=None)
-Traceback (most recent call last):
-...
-ValueError: Cannot use None as a query value
-
-# Can't use None on anything other than __exact
->>> Choice.objects.filter(foo__gt=None)
-Traceback (most recent call last):
-...
-ValueError: Cannot use None as a query value
-
-# Related managers use __exact=None implicitly if the object hasn't been saved.
->>> p2 = Poll(question="How?")
->>> p2.choice_set.all()
-[]
-
-# Querying across reverse relations and then another relation should insert
-# outer joins correctly so as not to exclude results.
->>> obj = OuterA.objects.create()
->>> OuterA.objects.filter(inner__second=None)
-[<OuterA: OuterA object>]
->>> OuterA.objects.filter(inner__second__data=None)
-[<OuterA: OuterA object>]
->>> _ = Inner.objects.create(first=obj)
->>> Inner.objects.filter(first__inner__second=None)
-[<Inner: Inner object>]
-
-
-"""}

tests/regressiontests/null_queries/tests.py

@@ -0,0 +1,69 @@
+from django.test import TestCase
+from django.core.exceptions import FieldError
+
+from regressiontests.null_queries.models import *
+
+
+class NullQueriesTests(TestCase):
+
+    def test_none_as_null(self):
+        """
+        Regression test for the use of None as a query value.
+
+        None is interpreted as an SQL NULL, but only in __exact queries.
+        Set up some initial polls and choices
+        """
+        p1 = Poll(question='Why?')
+        p1.save()
+        c1 = Choice(poll=p1, choice='Because.')
+        c1.save()
+        c2 = Choice(poll=p1, choice='Why Not?')
+        c2.save()
+
+        # Exact query with value None returns nothing ("is NULL" in sql,
+        # but every 'id' field has a value).
+        self.assertQuerysetEqual(Choice.objects.filter(choice__exact=None), [])
+
+        # Excluding the previous result returns everything.
+        self.assertQuerysetEqual(
+                Choice.objects.exclude(choice=None).order_by('id'),
+                [
+                    '<Choice: Choice: Because. in poll Q: Why? >',
+                    '<Choice: Choice: Why Not? in poll Q: Why? >'
+                ]
+        )
+
+        # Valid query, but fails because foo isn't a keyword
+        self.assertRaises(FieldError, Choice.objects.filter, foo__exact=None)
+
+        # Can't use None on anything other than __exact
+        self.assertRaises(ValueError, Choice.objects.filter, id__gt=None)
+
+        # Can't use None on anything other than __exact
+        self.assertRaises(ValueError, Choice.objects.filter, foo__gt=None)
+
+        # Related managers use __exact=None implicitly if the object hasn't been saved.
+        p2 = Poll(question="How?")
+        self.assertEquals(repr(p2.choice_set.all()), '[]')
+
+    def test_reverse_relations(self):
+        """
+        Querying across reverse relations and then another relation should
+        insert outer joins correctly so as not to exclude results.
+        """
+        obj = OuterA.objects.create()
+        self.assertQuerysetEqual(
+            OuterA.objects.filter(inner__second=None),
+            ['<OuterA: OuterA object>']
+        )
+        self.assertQuerysetEqual(
+            OuterA.objects.filter(inner__second__data=None),
+            ['<OuterA: OuterA object>']
+        )
+
+        inner_obj = Inner.objects.create(first=obj)
+        self.assertQuerysetEqual(
+            Inner.objects.filter(first__inner__second=None),
+            ['<Inner: Inner object>']
+        )
+