code: def test_integral(self, xp, scp):
      # x for x < 1 else 2 - x
      b = scp.interpolate.BSpline.basis_element(xp.asarray([0, 1, 2]))
  
      ret = []
      ret.append(b.integrate(0, 1))
      ret.append(b.integrate(1, 0))
      ret.append(b.integrate(1, 0))
  
      # extrapolate or zeros outside of [0, 2]; default is yes
      ret.append(b.integrate(-1, 1))
      ret.append(b.integrate(-1, 1, extrapolate=True))
      ret.append(b.integrate(-1, 1, extrapolate=False))
      ret.append(b.integrate(1, -1, extrapolate=False))
  
      # Test ``_fitpack._splint()``
      ret.append(b.integrate(1, -1, extrapolate=False))
  
      # Test ``extrapolate='periodic'``.
      b.extrapolate = "periodic"
  
      ret.append(b.integrate(0, 2))
      ret.append(b.integrate(2, 0))
      ret.append(b.integrate(-9, -7))
      ret.append(b.integrate(-8, -4))
      ret.append(b.integrate(0.5, 1.5))
      ret.append(b.integrate(1.5, 3))
      ret.append(b.integrate(1.5 + 12, 3 + 12))
      ret.append(b.integrate(1.5, 3 + 12))
      ret.append(b.integrate(0, -1))
      ret.append(b.integrate(-9, -10))
      ret.append(b.integrate(0, -9))
      return [xp.asarray(x) for x in ret]
  
imports: import pytest
  import inspect
  from cupy import testing
  from cupy_backends.cuda.api import driver
  from cupy_backends.cuda.api import runtime
  import numpy
  import cupyx.scipy.interpolate
label_desc: Use image node_id 25 for calling the TestBSpline obj's underlying member method code with example usage: obj.test_integral(xp, scp) and returns: unknown