Update test_wsgiref.py

Author: benediktjohannes

Lib/test/test_wsgiref.py

@@ -856,7 +856,7 @@ def testRaisesControlCharacters(self):
                 headers = [('x','y')]
                 # HTAB (\x09) is allowed in values, but not in names.
                 if c0 == "\t":
-                    base.start_response(f"key{c0}", headers)
+                    self.assertRaises(AssertionError, base.start_response, f"key{c0}", headers)
                 else:
                     self.assertRaises(ValueError, base.start_response, f"key{c0}", headers)