code: def setUp(self):
      self.locations = [(-5.0, 5.0), (10.0, 10.0)]
      self.kwargs = {
          "stroke_color": None,
          "hover_text": "",
          "fill_color": "red",
          "scale": 5,
          "fill_opacity": 1.0,
          "stroke_opacity": 1.0,
          "info_box_content": None,
          "display_info_box": None,
      }
  
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 1 for calling the SymbolLayer obj's underlying member method code with example usage: obj.setUp() without return types