code: def test_rgb_uint8(binary_string):
      fig = px.imshow(img_rgb, binary_string=binary_string)
      assert fig.data[0]["zmax"] is None
  
imports: import plotly.express
  import numpy
  import pytest
  import xarray
  from PIL import Image
  from io import BytesIO
  import base64
  import datetime
  from plotly.express.imshow_utils import rescale_intensity
label_desc: Use image node_id 2 for calling a global function with example usage: test_rgb_uint8(binary_string) without return types