class_docstr: Test SEVIRI base.
docstr: Test the vertical hrv padding.
docstr_tok: ["Test","the","vertical","hrv","padding","."]
code: def test_pad_data_vertically():
      """Test the vertical hrv padding."""
      data = xr.DataArray(data=np.zeros((10, 1)), dims=("y", "x"))
      south_bound = 4
      north_bound = 13
      final_size = (20, 1)
      res = pad_data_vertically(
          data, final_size, south_bound, north_bound
      )
      expected = np.zeros(final_size)
      expected[:] = np.nan
      expected[south_bound - 1 : north_bound] = 0.0
      np.testing.assert_equal(res, expected)
  
imports: import unittest
  from datetime import datetime, timedelta
  import dask.array
  import numpy
  import pytest
  import xarray
  from satpy.readers.seviri_base import MEIRINK_COEFS, MEIRINK_EPOCH, NoValidOrbitParams, OrbitPolynomial, OrbitPolynomialFinder, SEVIRICalibrationHandler, chebyshev, dec10216, get_cds_time, get_padding_area, get_satpos, pad_data_horizontally, pad_data_vertically, round_nom_time
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 12 for calling the SeviriBaseTest obj's underlying member method code with example usage: obj.test_pad_data_vertically() without return types