tests: ensure media_root is clean before tests

Author: igorsobreira

tests/test_admin.py

@@ -19,7 +19,7 @@
 class ClonableModelAdminTests(WebTest):
 
     def setUp(self):
-        shutil.rmtree(settings.MEDIA_ROOT)
+        rm_rf(settings.MEDIA_ROOT)
         User.objects.create_superuser(
             username='admin',
             password='admin',
@@ -306,6 +306,13 @@ def test_clone_should_keep_file_path_from_original_object_on_submit(self):
 
 
 
+def rm_rf(path):
+    try:
+        shutil.rmtree(path)
+    except OSError:
+        pass
+
+
 # asserts
 
 def assert_input(response, name, value=None):