class_docstr: Test the IciL1bNCFileHandler reader.
class_docstr_tok: ["Test","the","IciL1bNCFileHandler","reader","."]
docstr: Tes get dataset return none if data does not exist.
docstr_tok: ["Tes","get","dataset","return","none","if","data","does","not","exist","."]
code: def test_get_dataset_return_none_if_data_not_exist(self, reader):
      """Tes get dataset return none if data does not exist."""
      dataset_id = {"name": "unknown"}
      dataset_info = {"file_key": "non/existing/data"}
      dataset = reader.get_dataset(dataset_id, dataset_info)
      assert dataset is None
  
imports: from datetime import datetime
  from unittest.mock import patch
  import numpy
  import pytest
  import xarray
  from netCDF4 import Dataset
  from satpy.readers.ici_l1b_nc import IciL1bNCFileHandler, InterpolationType
label_desc: Use image node_id 19 for calling the TestIciL1bNCFileHandler obj's underlying member method code with example usage: obj.test_get_dataset_return_none_if_data_not_exist(reader) without return types