code: def test_unique_coord_names():
      unique = ("i", "j", "k")
      notuniq = ("i", "i", "k")
      coordsys = CoordinateSystem(unique)
      assert coordsys.coord_names == unique
      pytest.raises(ValueError, CoordinateSystem, notuniq)
  
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 5 for calling a global function with example usage: test_unique_coord_names() without return types