convert usage of fail* to assert*
diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py
index ddbcc06..c4faead 100644
--- a/Lib/test/test_largefile.py
+++ b/Lib/test/test_largefile.py
@@ -145,7 +145,7 @@
         for pos in (2**31-1, 2**31, 2**31+1):
             with self.open(TESTFN, 'rb') as f:
                 f.seek(pos)
-                self.assert_(f.seekable())
+                self.assertTrue(f.seekable())
 
 
 def test_main():