class_docstr: Test the FciL2NCSegmentFileHandler reader.
class_docstr_tok: ["Test","the","FciL2NCSegmentFileHandler","reader","."]
docstr: Test the correct execution of the _slice_dataset function with 'vis_channel_id' and 'category_id' set.
docstr_tok: ["Test","the","correct","execution","of","the","_slice_dataset","function","with","'vis_channel_id","'","and","'category_id","'","set","."]
code: def test_dataset_slicing_visid_catid(self):
      """Test the correct execution of the _slice_dataset function with 'vis_channel_id' and 'category_id' set."""
      self.fh = FciL2NCSegmentFileHandler(
          filename=self.seg_test_file,
          filename_info={},
          filetype_info={},
      )
  
      self.fh.nc = self.fh.nc.rename_dims(
          {"number_of_channels": "number_of_vis_channels"}
      )
      dataset = self.fh.get_dataset(
          make_dataid(name="test_values", resolution=32000),
          {
              "name": "test_values",
              "file_key": "test_values",
              "fill_value": -999,
              "vis_channel_id": 3,
              "category_id": 3,
          },
      )
      expected_dataset = self._get_unique_array(3, 3)
      np.testing.assert_allclose(dataset.values, expected_dataset)
  
imports: import os
  import unittest
  import uuid
  from contextlib import suppress
  from unittest import mock
  import numpy
  import pytest
  from netCDF4 import Dataset
  from pyresample import geometry
  from satpy.readers.fci_l2_nc import FciL2NCAMVFileHandler, FciL2NCFileHandler, FciL2NCSegmentFileHandler
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 11 for calling the TestFciL2NCSegmentFileHandler obj's underlying member method code with example usage: obj.test_dataset_slicing_visid_catid() without return types