code: def test_indefinite(self):
      # 2) Infinite integration limits --- Euler's constant
      assert_quad(
          quad(self._multivariate_indefinite, 0, np.inf),
          0.577215664901532860606512,
      )
  
imports: import sys
  import math
  import numpy
  from numpy import sqrt, cos, sin, arctan, exp, log, pi
  from numpy.testing import assert_, assert_allclose, assert_array_less, assert_almost_equal
  import pytest
  from scipy.integrate import quad, dblquad, tplquad, nquad
  from scipy.special import erf, erfc
  from scipy._lib._ccallback import LowLevelCallable
  import ctypes
  import ctypes.util
  from scipy._lib._ccallback_c import sine_ctypes
  import scipy.integrate._test_multivariate
label_desc: Use image node_id 3 for calling the TestMultivariateCtypesQuad obj's underlying member method code with example usage: obj.test_indefinite() without return types