test: add clear_all method to FakeConsole

Author: sharmaigne

Lib/test/test_pyrepl/support.py

@@ -155,6 +155,9 @@ def beep(self) -> None:
     def clear(self) -> None:
         pass
 
+    def clear_all(self) -> None:
+        pass
+
     def finish(self) -> None:
         pass