convert old fail* assertions to assert*
diff --git a/Lib/test/test_minidom.py b/Lib/test/test_minidom.py
index 76b7354..0a0a663 100644
--- a/Lib/test/test_minidom.py
+++ b/Lib/test/test_minidom.py
@@ -733,7 +733,7 @@
     def check_clone_attribute(self, deep, testName):
         doc = parseString("<doc attr='value'/>")
         attr = doc.documentElement.getAttributeNode("attr")
-        self.failIfEqual(attr, None)
+        self.assertNotEqual(attr, None)
         clone = attr.cloneNode(deep)
         self.confirm(not clone.isSameNode(attr))
         self.confirm(not attr.isSameNode(clone))