code: def test_groupby_string_index_name(myindex):
      # GH-Issue #3420
      data = {"index": myindex, "data": [0, 1] * 4}
      df = cudf.DataFrame(data=data)
      ddf = dask_cudf.from_cudf(df, npartitions=2)
      gdf = ddf.groupby("index").agg({"data": "count"})
  
      assert gdf.compute().index.name == gdf.index.name
  
imports: import numpy
  import pandas
  import pytest
  import dask
  from dask import dataframe
  from dask.utils_test import hlg_layer
  import cudf
  import dask_cudf
  from dask_cudf.groupby import OPTIMIZED_AGGS, _aggs_optimized
label_desc: Use image node_id 12 for calling a global function with example usage: test_groupby_string_index_name(myindex) without return types