code: def test_all_pandas_df(self):
      pd = pytest.importorskip("pandas")
      df = pd.DataFrame.from_records(
          [
              list(self.locations[0]) + ["text1", "a"],
              list(self.locations[1]) + ["text2", "b"],
          ],
          columns=["latitude", "longitude", "hover_text", "label"],
      )
      options = self._add_default_options(
          hover_text=df["hover_text"], label=df["label"]
      )
      markers = marker_layer(df[["latitude", "longitude"]], **options)
      locations = [marker.location for marker in markers.markers]
      assert locations == self.locations
      hover_texts = [marker.hover_text for marker in markers.markers]
      assert hover_texts == ["text1", "text2"]
      labels = [marker.label for marker in markers.markers]
      assert labels == ["a", "b"]
  
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 12 for calling the MarkerLayer obj's underlying member method code with example usage: obj.test_all_pandas_df() without return types