code: def test_logy_opts(self, df, backend):
      plot = df.hvplot.scatter("x", "y", c="category", logy=True)
      opts = Store.lookup_options(backend, plot, "plot")
      assert opts.kwargs["logx"] is False
      assert opts.kwargs["logy"] is True
      assert opts.kwargs.get("logz") is None
  
imports: import hvplot
  import holoviews
  import numpy
  import pandas
  import pytest
  import xarray
  from holoviews import Store
  from holoviews.core.options import Options, OptionTree
label_desc: Use image node_id 21 for calling the TestOptions obj's underlying member method code with example usage: obj.test_logy_opts(df, backend) without return types