code: def test_get_gdal_data():
      gdal_data = get_gdal_data()
      if gdal_data is not None:
          assert isinstance(gdal_data, str) and gdal_data
  
imports: import pytest
  from rasterio._env import GDALDataFinder, PROJDataFinder, get_proj_data_search_paths, get_gdal_data
  from .conftest import gdal_version
label_desc: Use image node_id 20 for calling a global function with example usage: test_get_gdal_data() without return types