code: def test_update_append_notify(self):
      tbl = Table([{"a": "abc", "b": 123}])
      view = tbl.view()
      assert view.num_rows() == 1
      tbl.update([{"a": "def", "b": 456}])
      assert view.to_records() == [
          {"a": "abc", "b": 123},
          {"a": "def", "b": 456},
      ]
  
imports: import numpy
  import pyarrow
  import pandas
  from datetime import date, datetime
  from perspective.table import Table
  from pytest import mark
label_desc: Use image node_id 21 for calling the TestUpdate obj's underlying member method code with example usage: obj.test_update_append_notify() without return types