code: def setUp(self):
      self.locations = [(-5.0, 5.0), (10.0, 10.0)]
  
imports: import unittest
  import pytest
  import traitlets
  from ..heatmap import _HeatmapOptionsMixin, heatmap_layer, Heatmap, WeightedHeatmap
  from ..geotraitlets import InvalidPointException, InvalidWeightException
label_desc: Use image node_id 1 for calling the TestHeatmap obj's underlying member method code with example usage: obj.setUp() without return types