code: def test_get_p_RdBl_cmap():
      cmap = get_p_RdBl_cmap()
      assert isinstance(
          cmap, LinearSegmentedColormap
      ), "Colormap is not an instance of LinearSegmentedColormap"
  
imports: import pytest
  from matplotlib.colors import LinearSegmentedColormap
  from data_describe.misc.colors import get_p_RdBl_cmap, mpl_to_plotly_cmap
label_desc: Use image node_id 1 for calling a global function with example usage: test_get_p_RdBl_cmap() without return types