code: def _sunz_stacked_area_def():
      """Get fake stacked area for testing sunz generation."""
      area1 = AreaDefinition(
          "test",
          "test",
          "test",
          {"proj": "merc"},
          2,
          1,
          (-2000, 0, 2000, 2000),
      )
      area2 = AreaDefinition(
          "test",
          "test",
          "test",
          {"proj": "merc"},
          2,
          1,
          (-2000, -2000, 2000, 0),
      )
      return StackedAreaDefinition(area1, area2)
  
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 3 for calling a global function with example usage: _sunz_stacked_area_def() and returns: StackedAreaDefinition