Merged regressiontests and modeltests into the test root.

tests/null_queries/models.py

@@ -0,0 +1,32 @@
+from __future__ import unicode_literals
+
+from django.db import models
+from django.utils.encoding import python_2_unicode_compatible
+
+
+@python_2_unicode_compatible
+class Poll(models.Model):
+    question = models.CharField(max_length=200)
+
+    def __str__(self):
+        return "Q: %s " % self.question
+
+@python_2_unicode_compatible
+class Choice(models.Model):
+    poll = models.ForeignKey(Poll)
+    choice = models.CharField(max_length=200)
+
+    def __str__(self):
+        return "Choice: %s in poll %s" % (self.choice, self.poll)
+
+# A set of models with an inner one pointing to two outer ones.
+class OuterA(models.Model):
+    pass
+
+class OuterB(models.Model):
+    data = models.CharField(max_length=10)
+
+class Inner(models.Model):
+    first = models.ForeignKey(OuterA)
+    # second would clash with the __second lookup.
+    third = models.ForeignKey(OuterB, null=True)