code: def test_image_converter_no_out():
      data = {"image.png": b"content"}
      converter = ImageConverter("image.png", data)
      datapoints, _ = converter.flat_datapoints("r")
  
      assert datapoints[0] == {
          REVISION: "r",
          FILENAME: "image.png",
          SRC: converter._encode_image(b"content"),
      }
  
imports: from dvc.render import FILENAME, REVISION, SRC
  from dvc.render.converter.image import ImageConverter
label_desc: Use image node_id 1 for calling a global function with example usage: test_image_converter_no_out() without return types