diff --git a/external_file_location/$ b/external_file_location/$
new file mode 100644
index 00000000..7243ff70
--- /dev/null
+++ b/external_file_location/$
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+###############################################################################
+#
+#   Copyright (C) 2015 Akretion (http://www.akretion.com).
+#   @author Valentin CHEMIERE <valentin.chemiere@akretion.com>
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU Affero General Public License as
+#   published by the Free Software Foundation, either version 3 of the
+#   License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU Affero General Public License for more details.
+#
+#   You should have received a copy of the GNU Affero General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###############################################################################
+
+import mock
+from contextlib import contextmanager
+
+class ConnMock(object):
+
+    def __init__(self, response):
+        import ipdb; ipdb.set_trace()
+        self.response = response
+
+    def isfile(self, path):
+        return self.response['isfile']
+
+    def makedir(self, path):
+        return self.response['makedir']
+
+    def exists(self, path):
+        return self.response['exists']
+
+    def open(self, path, mode):
+        return self.response['open']
+
+    def listdir(self, path):
+        return self.response['listdir']
+
+    def remove(self, path):
+        return self.response['remove']
+
+    def rename(self, source_path, target_path):
+        return self.response['rename']
+
+    def __call__(self, *args, **kwargs):
+        return self
+
+    def __exit__(self, *args, **kwargs):
+        pass
+
+@contextmanager
+def sftp_mock(response):
+    with mock.patch('fs.sftpfs.SFTPFS', ConnMock(response)) as SFTPFS:
+        yield
diff --git a/external_file_location/.ropeproject/globalnames b/external_file_location/.ropeproject/globalnames
index 77059482..2c841257 100644
Binary files a/external_file_location/.ropeproject/globalnames and b/external_file_location/.ropeproject/globalnames differ
diff --git a/external_file_location/.ropeproject/objectdb b/external_file_location/.ropeproject/objectdb
index 29c40cda..cddbe847 100644
--- a/external_file_location/.ropeproject/objectdb
+++ b/external_file_location/.ropeproject/objectdb
@@ -1 +1,3 @@
-€}q
.
\ No newline at end of file
+€}q
(Utests/test_sftp.pyq}U/usr/lib/python2.7/tempfile.py}qUNamedTemporaryFilecrope.base.oi.memorydb
+ScopeInfo
+q)q}q(Unone…qhhhhUunknown…tUinstanceUdefinedU/usr/lib/python2.7/tempfile.pyU_TemporaryFileWrapper‡†s}q†bsu.
\ No newline at end of file
diff --git a/external_file_location/tasks/ftp.py b/external_file_location/tasks/ftp.py
index d480f2fa..928be2ea 100644
--- a/external_file_location/tasks/ftp.py
+++ b/external_file_location/tasks/ftp.py
@@ -42,7 +42,8 @@ class FtpImportTask(FtpTask):
     _synchronize_type = 'import'
 
     def run(self):
-        with ftpfs.FTPFS(self.host, self.user, self.pwd, port=self.port) as ftp_conn:
+        with ftpfs.FTPFS(self.host, self.user, self.pwd,
+                         port=self.port) as ftp_conn:
             files_to_process = self._get_files(ftp_conn, self.path)
             for file_to_process in files_to_process:
                 self._process_file(ftp_conn, file_to_process)
@@ -57,10 +58,8 @@ class FtpExportTask(FtpTask):
             if attachment.state in ('pending', 'failed'):
                 self.attachment_id = attachment
                 with ftpfs.FTPFS(self.host, self.user, self.pwd,
-                           port=self.port) as ftp_conn:
+                                 port=self.port) as ftp_conn:
                     self._upload_file(ftp_conn, self.host, self.port,
-                                      self.user,
-                                      self.pwd,
-                                      self.path,
+                                      self.user, self.pwd, self.path,
                                       attachment.datas_fname,
                                       b64decode(attachment.datas))
diff --git a/external_file_location/tasks/sftp.py b/external_file_location/tasks/sftp.py
index 25f0a53d..f4bacd8f 100644
--- a/external_file_location/tasks/sftp.py
+++ b/external_file_location/tasks/sftp.py
@@ -44,8 +44,10 @@ class SftpImportTask(SftpTask):
     def run(self):
         connection_string = "{}:{}".format(self.host, self.port)
         root = "/home/{}".format(self.user)
-        with sftpfs.SFTPFS(connection=connection_string, root_path=root,
-                    username=self.user, password=self.pwd) as sftp_conn:
+        with sftpfs.SFTPFS(connection=connection_string,
+                           root_path=root,
+                           username=self.user,
+                           password=self.pwd) as sftp_conn:
             files_to_process = self._get_files(sftp_conn, self.path)
             for file_to_process in files_to_process:
                 self._process_file(sftp_conn, file_to_process)
@@ -61,12 +63,9 @@ class SftpExportTask(SftpTask):
                 self.attachment_id = attachment
                 connection_string = "{}:{}".format(self.host, self.port)
                 with sftpfs.SFTPFS(connection=connection_string,
-                            username=self.user,
-                            password=self.pwd) as sftp_conn:
+                                   username=self.user,
+                                   password=self.pwd) as sftp_conn:
                     datas = b64decode(attachment.datas)
                     self._upload_file(sftp_conn, self.host, self.port,
-                                      self.user,
-                                      self.pwd,
-                                      self.path,
-                                      attachment.datas_fname,
-                                      datas)
+                                      self.user, self.pwd, self.path,
+                                      attachment.datas_fname, datas)