diff --git a/euscanwww/djeuscan/tests/euscan_factory.py b/euscanwww/djeuscan/tests/euscan_factory.py
index 8a36c69..2f72685 100644
--- a/euscanwww/djeuscan/tests/euscan_factory.py
+++ b/euscanwww/djeuscan/tests/euscan_factory.py
@@ -13,15 +13,15 @@ def random_string(length=10):
 class HerdFactory(factory.Factory):
     FACTORY_FOR = Herd
 
-    herd = 'Test Herd'
-    email = 'herd@testherd.com'
+    herd = factory.LazyAttribute(lambda a: random_string())
+    email = factory.LazyAttribute(lambda a: "%s@example.com" % a.herd)
 
 
 class MaintainerFactory(factory.Factory):
     FACTORY_FOR = Maintainer
 
-    herd = 'Test Maintainer'
-    email = 'maintainer@testmaintainer.com'
+    name = factory.LazyAttribute(lambda a: random_string())
+    email = factory.LazyAttribute(lambda a: "%s@example.com" % a.name)
 
 
 class PackageFactory(factory.Factory):
diff --git a/euscanwww/djeuscan/tests/test_charts.py b/euscanwww/djeuscan/tests/test_charts.py
index 5d580dd..f4cb865 100644
--- a/euscanwww/djeuscan/tests/test_charts.py
+++ b/euscanwww/djeuscan/tests/test_charts.py
@@ -1,4 +1,6 @@
-from euscanwww.djeuscan.tests import SystemTestCase
+from djeuscan.tests import SystemTestCase
+from djeuscan.tests.euscan_factory import MaintainerFactory, HerdFactory, \
+    PackageFactory
 
 
 class ChartTests(SystemTestCase):
@@ -6,6 +8,12 @@ class ChartTests(SystemTestCase):
     Test charts
     """
 
+    def setUp(self):
+        super(ChartTests, self).setUp()
+        self.a_herd = HerdFactory.create()
+        self.a_maintainer = MaintainerFactory.create()
+        self.a_category = PackageFactory.create().category
+
     def test_statistics(self):
         response = self.get("statistics")
         self.assertEqual(response.status_code, 200)
@@ -59,3 +67,18 @@ class ChartTests(SystemTestCase):
     def test_versions_option_incorrect(self):
         response = self.get("chart", chart="versions-trololol")
         self.assertEqual(response.status_code, 404)
+
+    def test_herd(self):
+        response = self.get("chart_herd", chart="pie-packages",
+                            herd=self.a_herd.herd)
+        self.assertEqual(response.status_code, 200)
+
+    def test_maintainer(self):
+        response = self.get("chart_maintainer", chart="pie-packages",
+                            maintainer_id=self.a_maintainer.pk)
+        self.assertEqual(response.status_code, 200)
+
+    def test_category(self):
+        response = self.get("chart_category", chart="pie-packages",
+                            category=self.a_category)
+        self.assertEqual(response.status_code, 200)
diff --git a/euscanwww/djeuscan/tests/test_models.py b/euscanwww/djeuscan/tests/test_models.py
index a4fcbb1..4a320df 100644
--- a/euscanwww/djeuscan/tests/test_models.py
+++ b/euscanwww/djeuscan/tests/test_models.py
@@ -39,3 +39,4 @@ class EuscanResultModelTests(unittest.TestCase):
         result1 = EuscanResultFactory.create(datetime=datetime(2012, 04, 01))
         result2 = EuscanResultFactory.create(datetime=datetime(2012, 01, 01))
         self.assertEqual(result1, EuscanResult.objects.latest())
+        self.assertNotEqual(result2, EuscanResult.objects.latest())