convert old fail* assertions to assert*
diff --git a/Lib/test/test_defaultdict.py b/Lib/test/test_defaultdict.py
index 00bd9dc..35468b4 100644
--- a/Lib/test/test_defaultdict.py
+++ b/Lib/test/test_defaultdict.py
@@ -25,21 +25,21 @@
         d1[13]
         d1[14]
         self.assertEqual(d1, {12: [42, 24], 13: [], 14: []})
-        self.assert_(d1[12] is not d1[13] is not d1[14])
+        self.assertTrue(d1[12] is not d1[13] is not d1[14])
         d2 = defaultdict(list, foo=1, bar=2)
         self.assertEqual(d2.default_factory, list)
         self.assertEqual(d2, {"foo": 1, "bar": 2})
         self.assertEqual(d2["foo"], 1)
         self.assertEqual(d2["bar"], 2)
         self.assertEqual(d2[42], [])
-        self.assert_("foo" in d2)
-        self.assert_("foo" in d2.keys())
-        self.assert_("bar" in d2)
-        self.assert_("bar" in d2.keys())
-        self.assert_(42 in d2)
-        self.assert_(42 in d2.keys())
-        self.assert_(12 not in d2)
-        self.assert_(12 not in d2.keys())
+        self.assertTrue("foo" in d2)
+        self.assertTrue("foo" in d2.keys())
+        self.assertTrue("bar" in d2)
+        self.assertTrue("bar" in d2.keys())
+        self.assertTrue(42 in d2)
+        self.assertTrue(42 in d2.keys())
+        self.assertTrue(12 not in d2)
+        self.assertTrue(12 not in d2.keys())
         d2.default_factory = None
         self.assertEqual(d2.default_factory, None)
         try:
@@ -68,7 +68,7 @@
         self.assertEqual(repr(d2), "defaultdict(<class 'int'>, {12: 42})")
         def foo(): return 43
         d3 = defaultdict(foo)
-        self.assert_(d3.default_factory is foo)
+        self.assertTrue(d3.default_factory is foo)
         d3[13]
         self.assertEqual(repr(d3), "defaultdict(%s, {13: 43})" % repr(foo))
 
@@ -127,7 +127,7 @@
         d2 = copy.deepcopy(d1)
         self.assertEqual(d2.default_factory, foobar)
         self.assertEqual(d2, d1)
-        self.assert_(d1[1] is not d2[1])
+        self.assertTrue(d1[1] is not d2[1])
         d1.default_factory = list
         d2 = copy.deepcopy(d1)
         self.assertEqual(d2.default_factory, list)
@@ -150,7 +150,7 @@
             def _factory(self):
                 return []
         d = sub()
-        self.assert_(repr(d).startswith(
+        self.assertTrue(repr(d).startswith(
             "defaultdict(<bound method sub._factory of defaultdict(..."))
 
         # NOTE: printing a subclass of a builtin type does not call its