code: def test_grouped_box_layout_axes_shape_cols_groupby(
      self, hist_df, cols, res
  ):
      df = hist_df
      df.groupby("classroom").boxplot(
          column=["height", "weight", "category"],
          layout=(1, cols),
          return_type="dict",
      )
      _check_axes_shape(
          mpl.pyplot.gcf().axes, axes_num=3, layout=(1, res)
      )
  
imports: import itertools
  import string
  import numpy
  import pytest
  from pandas import DataFrame, MultiIndex, Series, date_range, plotting, timedelta_range
  import pandas._testing
  from pandas.tests.plotting.common import _check_axes_shape, _check_box_return_type, _check_plot_works, _check_ticks_props, _check_visible
  from pandas.io.formats.printing import pprint_thing
label_desc: Use image node_id 20 for calling the TestDataFrameGroupByPlots obj's underlying member method code with example usage: obj.test_grouped_box_layout_axes_shape_cols_groupby(hist_df, cols, res) without return types