code: def test_using_explicit_widgets_with_groupby_does_not_raise_error(
      self,
  ):
      import panel as pn
  
      x = pn.widgets.Select(
          name="x", value="sepal_length", options=self.cols
      )
      y = pn.widgets.Select(
          name="y", value="sepal_width", options=self.cols
      )
  
      pane = self.flowers.hvplot(x, y, groupby="species")
      assert isinstance(pane, pn.param.ParamFunction)
  
file_path: hvplot/hvplot/tests/testpanel.py
imports: from unittest import TestCase, SkipTest
  from hvplot.util import process_xarray
label_desc: Use image node_id 4 for calling the TestPanelObjects obj's underlying member method code with example usage: obj.test_using_explicit_widgets_with_groupby_does_not_raise_error() without return types