Add assert for leavingThisState

gsnedders · gsnedders · commit f06451eb8564 · 2021-01-05T13:32:13.000Z
diff --git a/html5lib/_tokenizer.py b/html5lib/_tokenizer.py
@@ -936,6 +936,7 @@ def attributeNameState(self):
             self.currentToken["data"][-1][0] += data
             leavingThisState = False
 
+        assert leavingThisState == ((self._state != self.attributeNameState) or emitToken)
         if leavingThisState:
             # Attributes are not dropped at this stage. That happens when the
             # start tag token is emitted so values can still be safely appended
