convert old fail* assertions to assert*
diff --git a/Lib/test/test_dbm_ndbm.py b/Lib/test/test_dbm_ndbm.py
index c5e968f..141d4b3 100755
--- a/Lib/test/test_dbm_ndbm.py
+++ b/Lib/test/test_dbm_ndbm.py
@@ -19,12 +19,12 @@
 
     def test_keys(self):
         self.d = dbm.ndbm.open(self.filename, 'c')
-        self.assert_(self.d.keys() == [])
+        self.assertTrue(self.d.keys() == [])
         self.d['a'] = 'b'
         self.d[b'bytes'] = b'data'
         self.d['12345678910'] = '019237410982340912840198242'
         self.d.keys()
-        self.assert_(b'a' in self.d)
+        self.assertTrue(b'a' in self.d)
         self.assertEqual(self.d[b'bytes'], b'data')
         self.d.close()