convert old fail* assertions to assert*
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index dec0980..eae4157 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -501,8 +501,8 @@
         f.close()
 
     def test_error(self):
-        self.assert_(issubclass(mmap.error, EnvironmentError))
-        self.assert_("mmap.error" in str(mmap.error))
+        self.assertTrue(issubclass(mmap.error, EnvironmentError))
+        self.assertTrue("mmap.error" in str(mmap.error))
 
     def test_io_methods(self):
         data = b"0123456789"