docstr: Flush manager state before each test method execution.
code: def setup_method(self):
      """Flush manager state before each test method execution."""
      MANAGER._tables = {}
      MANAGER._views = {}
  
file_path: perspective/python/perspective/perspective/tests/handlers/test_tornado_handler.py
imports: import random
  import pytest
  import tornado
  from datetime import datetime
  from perspective import Table, PerspectiveManager, PerspectiveTornadoHandler, PerspectiveError, tornado_websocket
label_desc: Use image node_id 1 for calling the TestPerspectiveTornadoHandler obj's underlying member method code with example usage: obj.setup_method() without return types