Test save_whitelist()

* Test save_whitelist failure scenarios

webapp/tests/test_whitelist.py

@@ -1,3 +1,5 @@
+import errno
+import mock
 import os
 import pickle
 
@@ -7,6 +9,8 @@
 from django.core.urlresolvers import reverse
 from django.test import TestCase
 
+from graphite.whitelist.views import save_whitelist
+
 class WhitelistTester(TestCase):
     settings.WHITELIST_FILE = os.path.join(DATA_DIR, 'lists/whitelist')
 
@@ -93,3 +97,14 @@ def test_whitelist_remove_missing(self):
         response = self.client.get(url)
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.content, "a.b.c.d\ne.f.g.h")
+
+    def test_save_whitelist(self):
+        self.addCleanup(self.wipe_whitelist)
+        self.assertEqual(save_whitelist({'a.b.c.d','e.f.g.h'}), None)
+
+    @mock.patch('os.rename')
+    def test_save_whitelist_rename_failure(self, rename):
+        self.addCleanup(self.wipe_whitelist)
+        rename.side_effect = OSError(errno.EPERM, 'Operation not permitted')
+        with self.assertRaises(OSError):
+            save_whitelist({'a.b.c.d','e.f.g.h'})