Merged regressiontests and modeltests into the test root.

tests/cache/models.py

@@ -0,0 +1,13 @@
+from django.utils import timezone
+
+from django.db import models
+
+
+def expensive_calculation():
+    expensive_calculation.num_runs += 1
+    return timezone.now()
+
+class Poll(models.Model):
+    question = models.CharField(max_length=200)
+    answer = models.CharField(max_length=200)
+    pub_date = models.DateTimeField('date published', default=expensive_calculation)