class_docstr: Test the AHI gridded reader definition.
docstr: Check that a valid full disk area is produced.
docstr_tok: ["Check","that","a","valid","full","disk","area","is","produced","."]
code: def test_area_def(self):
      """Check that a valid full disk area is produced."""
      good_area = AreaDefinition(
          "gridded_himawari",
          "A gridded Himawari area",
          "longlat",
          "EPSG:4326",
          self.FULLDISK_SIZES[0.01]["x_size"],
          self.FULLDISK_SIZES[0.01]["y_size"],
          self.AHI_FULLDISK_EXTENT,
      )
  
      tmp_fh = self.make_fh("vis.01")
      tmp_fh.get_area_def(None)
      assert tmp_fh.area == good_area
  
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 6 for calling the TestAHIGriddedArea obj's underlying member method code with example usage: obj.test_area_def() without return types