code: def pytest_generate_tests(metafunc):
      if "supported_dtype" in metafunc.fixturenames:
          if metafunc.cls is None or not getattr(
              metafunc.cls, "image_class"
          ):
              raise pytest.UsageError(
                  "Attempting to use supported_dtype fixture outside an image test case"
              )
          # xdist needs a consistent ordering, so sort by class name
          supported_dtypes = sorted(
              supported_np_types(
                  metafunc.cls.image_class.header_class()
              ),
              key=lambda x: x.__name__,
          )
          metafunc.parametrize("supported_dtype", supported_dtypes)
  
label_desc: Use image node_id 1 for calling a global function with example usage: pytest_generate_tests(metafunc) without return types