[pitivi] tests: Fix test_utils_timeline to work with nosetests

[Thibault Saunier <tsaunier src gnome org>]

commit a50d1d9e42a75b01c1923f68ab059c061a056496
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Jul 10 18:19:09 2015 +0200

    tests: Fix test_utils_timeline to work with nosetests
    
    Summary: Depends on D254
    
    Reviewers: Mathieu_Du, aleb
    
    Differential Revision: https://phabricator.freedesktop.org/D255

 tests/test_utils_timeline.py |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/tests/test_utils_timeline.py b/tests/test_utils_timeline.py
index f68c1e7..94fd29a 100644
--- a/tests/test_utils_timeline.py
+++ b/tests/test_utils_timeline.py
@@ -22,7 +22,8 @@ from unittest import TestCase
 
 from gi.repository import GES
 
-from common import createTestClip
+from tests import common
+
 from pitivi.utils.timeline import Selected, Selection, SELECT, SELECT_ADD, \
     UNSELECT
 
@@ -55,8 +56,8 @@ class TestSelection(TestCase):
 
     def testGetSingleClip(self):
         selection = Selection()
-        clip1 = createTestClip(GES.UriClip)
-        clip2 = createTestClip(GES.TitleClip)
+        clip1 = common.createTestClip(GES.UriClip)
+        clip2 = common.createTestClip(GES.TitleClip)
 
         # Selection empty.
         self.assertFalse(selection.getSingleClip(GES.TitleClip))