code: def _sunz_bigger_area_def():
      """Get area that is twice the size of 'sunz_area_def'."""
      bigger_area = AreaDefinition(
          "test",
          "test",
          "test",
          {"proj": "merc"},
          4,
          4,
          (-2000, -2000, 2000, 2000),
      )
      return bigger_area
  
imports: import unittest
  from datetime import datetime
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  import xarray
  from pyresample.geometry import AreaDefinition, StackedAreaDefinition
  from pytest_lazyfixture import lazy_fixture
label_desc: Use image node_id 2 for calling a global function with example usage: _sunz_bigger_area_def() and returns: bigger_area