class_docstr: Test the IciL1bNCFileHandler reader.
class_docstr_tok: ["Test","the","IciL1bNCFileHandler","reader","."]
docstr: Test get third dimension name return none for 2d data.
docstr_tok: ["Test","get","third","dimension","name","return","none","for","2d","data","."]
code: def test_get_third_dimension_name_return_none_for_2d_data(
      self, reader
  ):
      """Test get third dimension name return none for 2d data."""
      data = xr.DataArray(np.ones((1, 1)), dims=("x", "y"))
      assert reader._get_third_dimension_name(data) 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 18 for calling the TestIciL1bNCFileHandler obj's underlying member method code with example usage: obj.test_get_third_dimension_name_return_none_for_2d_data(reader) without return types