code: def test_partitioned_format(self):
      out = StoreOptions.merge_options(
          ["plot", "style"],
          plot={"Image": dict(fig_size=150)},
          style={"Image": dict(cmap="Blues")},
      )
      self.assertEqual(out, self.expected)
  
imports: import numpy
  from holoviews import Curve, HoloMap, Image, Overlay
  from holoviews.core.options import Store, StoreOptions
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.plotting import mpl
label_desc: Use image node_id 4 for calling the TestStoreOptionsMerge obj's underlying member method code with example usage: obj.test_partitioned_format() without return types