code: def test_multiple_zs(self):
      plot = self.ds.hvplot(
          x="lat", y="lon", z=["temp", "precip"], dynamic=False
      )
      assert "temp" in plot.keys()
      assert "precip" in plot.keys()
      assert plot["temp"].kdims == ["lat", "lon"]
      assert plot["precip"].kdims == ["lat", "lon"]
  
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 22 for calling the TestGridPlots obj's underlying member method code with example usage: obj.test_multiple_zs() without return types