code: def test_bspline_extrap(self, xp, scp):
      b = self._make_random_spline(xp, scp)
      t, c, k = b.tck
      dt = t[-1] - t[0]
      xx = xp.linspace(t[k] - dt, t[-k - 1] + dt, 50)
      mask = (t[k] < xx) & (xx < t[-k - 1])
  
      return (
          b(xx[mask], extrapolate=self.extrapolate),
          b(xx, extrapolate=self.extrapolate),
      )
  
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 10 for calling the TestBSpline obj's underlying member method code with example usage: obj.test_bspline_extrap(xp, scp) and returns: b,  b