code: def sunz_sza():
      """Generate fake solar zenith angle data array for testing."""
      sza = xr.DataArray(
          np.rad2deg(
              np.arccos(
                  da.from_array(
                      [
                          [0.0149581333, 0.0146694376],
                          [0.0150812684, 0.0147925727],
                      ],
                      chunks=2,
                  )
              )
          ),
          attrs={"area": _sunz_area_def()},
          dims=("y", "x"),
          coords={"y": [0, 1], "x": [0, 1]},
      )
      return sza
  
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 9 for calling a global function with example usage: sunz_sza() and returns: sza