code: def test_chebys(self):
      S0 = orth.chebys(0)
      S1 = orth.chebys(1)
      S2 = orth.chebys(2)
      S3 = orth.chebys(3)
      S4 = orth.chebys(4)
      S5 = orth.chebys(5)
      assert_array_almost_equal(S0.c, [1], 13)
      assert_array_almost_equal(S1.c, [1, 0], 13)
      assert_array_almost_equal(S2.c, [1, 0, -1], 13)
      assert_array_almost_equal(S3.c, [1, 0, -2, 0], 13)
      assert_array_almost_equal(S4.c, [1, 0, -3, 0, 1], 13)
      assert_array_almost_equal(S5.c, [1, 0, -4, 0, 3, 0], 13)
  
imports: import numpy
  from numpy import array, sqrt
  from numpy.testing import assert_array_almost_equal, assert_equal, assert_almost_equal, assert_allclose
  from pytest import raises
  from scipy import integrate
  import scipy.special
  from scipy.special import gamma
  import scipy.special._orthogonal
label_desc: Use image node_id 2 for calling the TestCheby obj's underlying member method code with example usage: obj.test_chebys() without return types