class_docstr: Test the AHI gridded reader definition.
docstr: Create fake data for testing.
docstr_tok: ["Create","fake","data","for","testing","."]
code: def setUp(self):
      """Create fake data for testing."""
      self.FULLDISK_SIZES = {
          0.005: {"x_size": 24000, "y_size": 24000},
          0.01: {"x_size": 12000, "y_size": 12000},
          0.02: {"x_size": 6000, "y_size": 6000},
      }
  
      self.AHI_FULLDISK_EXTENT = [85.0, -60.0, 205.0, 60.0]
  
imports: import os
  import shutil
  import tempfile
  import unittest
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  from pyresample.geometry import AreaDefinition
  from satpy.readers.ahi_l1b_gridded_bin import AHI_LUT_NAMES, AHIGriddedFileHandler
label_desc: Use image node_id 1 for calling the TestAHIGriddedArea obj's underlying member method code with example usage: obj.setUp() without return types