code: def test_info_units(runner):
      """Find a units item"""
      result = runner.invoke(
          main_group, ["info", "tests/data/RGB.byte.tif"]
      )
      assert result.exit_code == 0
      assert '"units": [null, null, null]' in result.output
  
imports: import json
  import pytest
  import rasterio
  from rasterio.rio.main import main_group
  from .conftest import credentials
label_desc: Use image node_id 4 for calling a global function with example usage: test_info_units(runner) without return types