code: def test_branch_cut(self, result):
      desired = -0.21938393439552027368  # Computed using Mpmath
      assert_allclose(result, desired, atol=0, rtol=1e-14)
  
file_path: scipy/scipy/special/tests/test_exponential_integrals.py
imports: import pytest
  import numpy
  from numpy.testing import assert_allclose
  import scipy.special
label_desc: Use image node_id 1 for calling the TestExpi obj's underlying member method code with example usage: obj.test_branch_cut(result) without return types