From e8d1cccd59a14811965fee27f75529acb5cd1c2c Mon Sep 17 00:00:00 2001
From: "Guido A.J. Stevens" <guido.stevens@cosent.nl>
Date: Fri, 10 Jul 2015 11:19:34 +0000
Subject: [PATCH] improve test isolation

---
 src/plone/app/theming/tests/test_policy.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/plone/app/theming/tests/test_policy.py b/src/plone/app/theming/tests/test_policy.py
index 258f5c4d..c23f926b 100644
--- a/src/plone/app/theming/tests/test_policy.py
+++ b/src/plone/app/theming/tests/test_policy.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 import time
-import multiprocessing
 import threading
 import transaction
 import unittest2 as unittest
@@ -16,10 +15,16 @@ class TestFunctional(unittest.TestCase):
 
     layer = THEMING_FUNCTIONAL_TESTING
 
+    def setUp(self):
+        request = self.layer['request']
+        policy = theming_policy(request)
+        # avoid cache pollution from other tests
+        policy.invalidateCache()
+
     def tearDown(self):
         request = self.layer['request']
         policy = theming_policy(request)
-        # static class attribute is cached across test runs
+        # clear local thread caches
         policy.invalidateCache()
 
     def test_getSettings(self):