class_docstr: Test SEVIRI base.
docstr: Test the chebyshev function.
docstr_tok: ["Test","the","chebyshev","function","."]
code: def test_chebyshev(self):
      """Test the chebyshev function."""
      coefs = [1, 2, 3, 4]
      time = 123
      domain = [120, 130]
      res = chebyshev(coefs=[1, 2, 3, 4], time=time, domain=domain)
      exp = chebyshev4(coefs, time, domain)
      np.testing.assert_allclose(res, exp)
  
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 2 for calling the SeviriBaseTest obj's underlying member method code with example usage: obj.test_chebyshev() without return types