[pitivi] tests: Fix TestProjectManager.testBackupProject

[Alexandru Băluț <alexbalut src gnome org>]

commit 92052750cbab5c07cbb45a175f47688a0faf07b4
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Oct 3 16:10:30 2016 +0200

    tests: Fix TestProjectManager.testBackupProject
    
    Should have been part of 4895d2a65e1a9dfab02b89bb42b19984ddcd3849

 tests/test_project.py |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/tests/test_project.py b/tests/test_project.py
index d37c66d..3ead2f5 100644
--- a/tests/test_project.py
+++ b/tests/test_project.py
@@ -29,6 +29,7 @@ from gi.repository import Gst
 
 from pitivi.project import Project
 from pitivi.project import ProjectManager
+from pitivi.utils.misc import path_from_uri
 from tests import common
 
 
@@ -272,10 +273,10 @@ class TestProjectManager(TestCase):
         # Save the backup
         self.assertTrue(self.manager.saveProject(
             self.manager.current_project, backup=True))
-        self.assertTrue(uri_is_reachable(backup_uri))
+        self.assertTrue(os.path.isfile(path_from_uri(backup_uri)))
 
         self.manager.closeRunningProject()
-        self.assertFalse(uri_is_reachable(backup_uri),
+        self.assertFalse(os.path.isfile(path_from_uri(backup_uri)),
                          "Backup file not deleted when project closed")