class_docstr: Test the sum bucket resampler.
class_docstr_tok: ["Test","the","sum","bucket","resampler","."]
docstr: Create fake area definitions and resampler to be tested.
code: def setUp(self):
      """Create fake area definitions and resampler to be tested."""
      from satpy.resample import BucketSum
  
      get_lonlats = mock.MagicMock()
      get_lonlats.return_value = (1, 2)
      self.source_geo_def = mock.MagicMock(get_lonlats=get_lonlats)
      self.target_geo_def = mock.MagicMock(get_lonlats=get_lonlats)
      self.bucket = BucketSum(self.source_geo_def, self.target_geo_def)
  
imports: import os
  import shutil
  import tempfile
  import unittest
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  import xarray
  from pyproj import CRS
  from satpy.resample import NativeResampler
label_desc: Use image node_id 1 for calling the TestBucketSum obj's underlying member method code with example usage: obj.setUp() without return types