Fix Issue10759  - HTMLParser.unescape() to handle malform charrefs.
diff --git a/Lib/test/test_htmlparser.py b/Lib/test/test_htmlparser.py
index c45cf00..717585c 100644
--- a/Lib/test/test_htmlparser.py
+++ b/Lib/test/test_htmlparser.py
@@ -320,6 +320,11 @@
             ("endtag", "p"),
         ])
 
+    def test_unescape_function(self):
+        parser = HTMLParser.HTMLParser()
+        self.assertEqual(parser.unescape('&#bad;'),'&#bad;')
+        self.assertEqual(parser.unescape('&'),'&')
+
 
 def test_main():
     test_support.run_unittest(HTMLParserTestCase)