code: def test_histogram_by_category_legend_position(self, df, backend):
      plot = df.hvplot.hist("y", by="category", legend="left")
      opts = Store.lookup_options(backend, plot, "plot")
      assert opts.kwargs["legend_position"] == "left"
  
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 2 for calling the TestOptions obj's underlying member method code with example usage: obj.test_histogram_by_category_legend_position(df, backend) without return types