code: def test_update_append(self):
      tbl = Table([{"a": "abc", "b": 123}])
      tbl.update([{"a": "def", "b": 456}])
      assert tbl.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 6 for calling the TestUpdate obj's underlying member method code with example usage: obj.test_update_append() without return types