class_docstr: Test case for the file calibration types.
docstr: Create a test file handler.
docstr_tok: ["Create","a","test","file","handler","."]
code: def setUp(self):
      """Create a test file handler."""
      m = mock.mock_open()
      with mock.patch(
          "satpy.readers.ahi_l1b_gridded_bin.open", m, create=True
      ):
          in_fname = "test_file"
          fh = AHIGriddedFileHandler(
              in_fname,
              {"area": "fld"},
              filetype_info={"file_type": "tir.01"},
          )
          self.fh = fh
  
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 TestAHIGriddedFileCalibration obj's underlying member method code with example usage: obj.setUp() without return types