code: def test_add_without_name(self) -> None:
      ds = bms.ColumnDataSource()
      name = ds.add([1, 2, 3])
      assert name == "Series 0"
      name = ds.add([4, 5, 6])
      assert name == "Series 1"
  
imports: from __future__ import annotations
  import pytest
  import datetime
  import io
  import numpy
  import pandas
  from bokeh.models import Selection
  from bokeh.util.serialization import convert_datetime_array
  from bokeh.util.warnings import BokehDeprecationWarning
  import bokeh.models.sources
label_desc: Use image node_id 22 for calling the TestColumnDataSource obj's underlying member method code with example usage: obj.test_add_without_name() without return types