code: def test_locations_pandas_df(self):
      pd = pytest.importorskip("pandas")
      df = pd.DataFrame.from_records(
          self.locations, columns=["latitude", "longitude"]
      )
      options = self._add_default_options()
      markers = marker_layer(df, **options)
      locations = [marker.location for marker in markers.markers]
      assert locations == self.locations
  
imports: import unittest
  import pytest
  import numpy
  import traitlets
  from ..marker import MarkerOptions, Marker, Markers, Symbol, marker_layer, symbol_layer
label_desc: Use image node_id 11 for calling the MarkerLayer obj's underlying member method code with example usage: obj.test_locations_pandas_df() without return types