make test cwd independant

test/unittest_hooks.py

 # -*- coding: iso-8859-1 -*-
 from socket import gethostname
 from StringIO import StringIO
+from os.path import join
 
 from logilab.common.testlib import unittest_main
 
@@ -149,7 +150,7 @@ class ReplyCommentHooksTC(CubicWebTC):
 
     def test_comment_created(self):
         mi = MBOXImporter(self.cnx)
-        msg = open('data/reply.mbox', 'rb').read() % \
+        msg = open(join(self.datadir, 'reply.mbox'), 'rb').read() % \
               construct_message_id(self.vreg.config.appid, self.b.eid, False)
         mi.import_mbox_stream(StringIO(msg))
         self.commit()

test/unittest_mboximport.py

 """unit tests for email mbox import functionnality"""
 
 from StringIO import StringIO
+from os.path import join
 
 from logilab.common.testlib import TestCase, unittest_main
 
@@ -13,7 +14,7 @@ class MBOXImporterTC(CubicWebTC):
 
     def test_all(self):
         mi = MBOXImporter(self.cnx)
-        mi.import_mbox_stream(open('data/mbox'))
+        mi.import_mbox_stream(open(join(self.datadir, 'mbox')))
         self.assertEqual(sorted([(x, len(y)) for x, y in mi.created.items()]),
                                  [('email', 2), ('emailaddress', 4),
                                   ('emailpart', 5), ('emailthread', 2), ('file', 2)])