convert old fail* assertions to assert*
diff --git a/Lib/test/test_dbm_gnu.py b/Lib/test/test_dbm_gnu.py
index 857aeb1..2173b92 100755
--- a/Lib/test/test_dbm_gnu.py
+++ b/Lib/test/test_dbm_gnu.py
@@ -24,11 +24,11 @@
         self.g[b'bytes'] = b'data'
         key_set = set(self.g.keys())
         self.assertEqual(key_set, set([b'a', b'bytes', b'12345678910']))
-        self.assert_(b'a' in self.g)
+        self.assertTrue(b'a' in self.g)
         self.assertEqual(self.g[b'bytes'], b'data')
         key = self.g.firstkey()
         while key:
-            self.assert_(key in key_set)
+            self.assertTrue(key in key_set)
             key_set.remove(key)
             key = self.g.nextkey(key)
         self.assertRaises(KeyError, lambda: self.g['xxx'])
@@ -66,7 +66,7 @@
 
         self.g['x'] = 'x' * 10000
         size1 = os.path.getsize(filename)
-        self.assert_(size0 < size1)
+        self.assertTrue(size0 < size1)
 
         del self.g['x']
         # 'size' is supposed to be the same even after deleting an entry.
@@ -74,7 +74,7 @@
 
         self.g.reorganize()
         size2 = os.path.getsize(filename)
-        self.assert_(size1 > size2 >= size0)
+        self.assertTrue(size1 > size2 >= size0)
 
 
 def test_main():