code: def test_widget_schema_with_index(self):
      widget = PerspectiveWidget({"a": int}, index="a")
      assert widget.table.get_index() == "a"
  
imports: from datetime import date, datetime
  from functools import partial
  from types import MethodType
  import numpy
  from perspective import PerspectiveError, PerspectiveWidget, Table
  from pytest import raises
label_desc: Use image node_id 5 for calling the TestWidget obj's underlying member method code with example usage: obj.test_widget_schema_with_index() without return types