code: def rgb_image():
      """Fixture holding an RGB image for plotting."""
      with rio.open(path_to_example("rmnp-rgb.tif")) as src:
          rgb = src.read()
          ext = plotting_extent(src)
      return rgb, ext
  
imports: import numpy
  import numpy.ma
  import matplotlib.pyplot
  import pytest
  import rasterio
  from rasterio.plot import plotting_extent
  from earthpy.plot import plot_rgb, _stretch_im
  from earthpy.io import path_to_example
label_desc: Use image node_id 2 for calling a global function with example usage: rgb_image() and returns: rgb,  ext