2 files changed, 21 insertions, 9 deletions
diff --git a/tests/regressiontests/aggregation_regress/models.py b/tests/regressiontests/aggregation_regress/models.py
index 783c21956a..ccef9a5fc8 100644
--- a/tests/regressiontests/aggregation_regress/models.py
+++ b/tests/regressiontests/aggregation_regress/models.py
@@ -1,8 +1,5 @@
 # coding: utf-8
-import pickle
-
-from django.db import connection, models, DEFAULT_DB_ALIAS
-from django.conf import settings
+from django.db import models
 
 
 class Author(models.Model):
@@ -49,7 +46,6 @@ class Store(models.Model):
     def __unicode__(self):
         return self.name
 
-
 class Entries(models.Model):
     EntryID = models.AutoField(primary_key=True, db_column='Entry ID')
     Entry = models.CharField(unique=True, max_length=50)
diff --git a/tests/regressiontests/aggregation_regress/tests.py b/tests/regressiontests/aggregation_regress/tests.py
index 2429ffec94..6c09c10d72 100644
--- a/tests/regressiontests/aggregation_regress/tests.py
+++ b/tests/regressiontests/aggregation_regress/tests.py
@@ -1,13 +1,15 @@
 import datetime
+import pickle
 from decimal import Decimal
+from operator import attrgetter
 
-from django.core.exceptions import FieldError
 from django.conf import settings
-from django.test import TestCase, Approximate
+from django.core.exceptions import FieldError
 from django.db import DEFAULT_DB_ALIAS
 from django.db.models import Count, Max, Avg, Sum, StdDev, Variance, F
+from django.test import TestCase, Approximate
 
-from regressiontests.aggregation_regress.models import *
+from models import Author, Book, Publisher, Clues, Entries, HardbackBook
 
 
 def run_stddev_tests():
@@ -501,7 +503,7 @@ class AggregationTests(TestCase):
         # Regression for #10197 -- Queries with aggregates can be pickled.
         # First check that pickling is possible at all. No crash = success
         qs = Book.objects.annotate(num_authors=Count('authors'))
-        out = pickle.dumps(qs)
+        pickle.dumps(qs)
 
         # Then check that the round trip works.
         query = qs.query.get_compiler(qs.db).as_sql()[0]
@@ -659,6 +661,20 @@ class AggregationTests(TestCase):
             Author.objects.count()
         )
 
+    def test_f_expression_annotation(self):
+        # Books with less than 200 pages per author.
+        qs = Book.objects.values("name").annotate(
+            n_authors=Count("authors")
+        ).filter(
+            pages__lt=F("n_authors") * 200
+        ).values_list("pk")
+        self.assertQuerysetEqual(
+            Book.objects.filter(pk__in=qs), [
+                "Python Web Development with Django"
+            ],
+            attrgetter("name")
+        )
+
     if run_stddev_tests():
         def test_stddev(self):
             self.assertEqual(