class_docstr: Test the scene's aggregate method.
code: def _create_test_data(x_size, y_size):
      from pyresample.geometry import AreaDefinition
  
      scene1 = Scene()
      area_extent = (
          -5570248.477339745,
          -5561247.267842293,
          5567248.074173927,
          5570248.477339745,
      )
      proj_dict = {
          "a": 6378169.0,
          "b": 6356583.8,
          "h": 35785831.0,
          "lon_0": 0.0,
          "proj": "geos",
          "units": "m",
      }
      area_def = AreaDefinition(
          "test",
          "test",
          "test",
          proj_dict,
          x_size,
          y_size,
          area_extent,
      )
      scene1["1"] = xr.DataArray(
          np.ones((y_size, x_size)),
          attrs={"_satpy_id_keys": default_id_keys_config},
      )
      scene1["2"] = xr.DataArray(
          np.ones((y_size, x_size)),
          dims=("y", "x"),
          attrs={"_satpy_id_keys": default_id_keys_config},
      )
      scene1["3"] = xr.DataArray(
          np.ones((y_size, x_size)),
          dims=("y", "x"),
          attrs={
              "area": area_def,
              "_satpy_id_keys": default_id_keys_config,
          },
      )
      scene1["4"] = xr.DataArray(
          np.ones((y_size, x_size)),
          dims=("y", "x"),
          attrs={
              "area": area_def,
              "standard_name": "backscatter",
              "_satpy_id_keys": default_id_keys_config,
          },
      )
      return scene1
  
imports: from unittest import mock
  import numpy
  import pytest
  import xarray
  from dask import array
  from satpy import Scene
  from satpy.dataset.dataid import default_id_keys_config
  from satpy.tests.utils import make_cid, make_dataid
label_desc: Use image node_id 3 for calling the TestSceneAggregation obj's underlying member method code with example usage: obj._create_test_data(x_size, y_size) and returns: scene1