code: def test_failures():
      x = np.linspace(0, 1, 2)
      y = np.zeros((2, x.size))
      res = solve_bvp(exp_fun, exp_bc, x, y, tol=1e-5, max_nodes=5)
      assert_equal(res.status, 1)
      assert_(not res.success)
  
      x = np.linspace(0, 1, 5)
      y = np.zeros((2, x.size))
      res = solve_bvp(undefined_fun, undefined_bc, x, y)
      assert_equal(res.status, 2)
      assert_(not res.success)
  
imports: import sys
  import numpy
  from numpy.testing import assert_, assert_array_equal, assert_allclose, assert_equal
  from pytest import raises
  from scipy.sparse import coo_matrix
  from scipy.special import erf
  from scipy.integrate._bvp import modify_mesh, estimate_fun_jac, estimate_bc_jac, compute_jac_indices, construct_global_jac, solve_bvp
label_desc: Use image node_id 43 for calling a global function with example usage: test_failures() without return types