code: def test_datasetwriter_no_crs(tmp_path):
      """DatasetWriter constructor accepts string filenames."""
      filename = str(tmp_path.joinpath("lol.tif"))
      assert DatasetWriter(
          filename,
          "w",
          driver="GTiff",
          width=100,
          height=100,
          count=1,
          dtype="uint8",
      ).name.endswith("lol.tif")
  
imports: import pytest
  from rasterio.io import DatasetReader, DatasetWriter
label_desc: Use image node_id 3 for calling a global function with example usage: test_datasetwriter_no_crs(tmp_path) without return types