code: def test_manager_get_hosted_table_names(self):
      manager = PerspectiveManager()
      table = Table(data)
      manager.host_table("table1", table)
      assert manager.get_table_names() == ["table1"]
  
      manager.host_table("table2", table)
      assert manager.get_table_names() == ["table1", "table2"]
  
imports: import json
  import time
  import numpy
  import pyarrow
  from datetime import datetime
  from functools import partial
  from pytest import raises
  from perspective import Table, PerspectiveError, PerspectiveManager
label_desc: Use image node_id 7 for calling the TestPerspectiveManager obj's underlying member method code with example usage: obj.test_manager_get_hosted_table_names() without return types