code: def test_dataarray_unnamed_value_label(self):
      plot = self.da_rgb.sel(band=1).hvplot.image(value_label="test")
      assert plot.vdims[0].name == "test"
  
imports: import os
  import tempfile
  from unittest import SkipTest
  from collections import OrderedDict
  import numpy
  from holoviews import Store
  from holoviews.element import RGB, Image
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 27 for calling the TestGridPlots obj's underlying member method code with example usage: obj.test_dataarray_unnamed_value_label() without return types