code: def test___str__(eg_cs):
      s = str(eg_cs.cs)
      assert (
          s
          == "CoordinateSystem(coord_names=('i', 'j', 'k'), name='test', coord_dtype=float32)"
      )
  
imports: from types import SimpleNamespace
  import numpy
  import pytest
  from ..coordinate_system import CoordinateSystem, CoordinateSystemError, CoordSysMaker, CoordSysMakerError, is_coordsys, is_coordsys_maker, product, safe_dtype
label_desc: Use image node_id 12 for calling a global function with example usage: test___str__(eg_cs) without return types