code: def test_chebyu(self):
      U0 = orth.chebyu(0)
      U1 = orth.chebyu(1)
      U2 = orth.chebyu(2)
      U3 = orth.chebyu(3)
      U4 = orth.chebyu(4)
      U5 = orth.chebyu(5)
      assert_array_almost_equal(U0.c, [1], 13)
      assert_array_almost_equal(U1.c, [2, 0], 13)
      assert_array_almost_equal(U2.c, [4, 0, -1], 13)
      assert_array_almost_equal(U3.c, [8, 0, -4, 0], 13)
      assert_array_almost_equal(U4.c, [16, 0, -12, 0, 1], 13)
      assert_array_almost_equal(U5.c, [32, 0, -32, 0, 6, 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 4 for calling the TestCheby obj's underlying member method code with example usage: obj.test_chebyu() without return types