code: def test_quadratic_deriv_left(self, xp, scp):
      x, y = self.get_xy(xp)
      der = [(1, 8.0)]  # order, value: f'(x) = 8.
  
      # derivative at left-hand edge
      b = scp.interpolate.make_interp_spline(
          x, y, k=2, bc_type=(der, None)
      )
      return b(x), b(x[0], 1)
  
imports: import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import runtime
  import numpy
  import cupyx.scipy.interpolate
label_desc: Use image node_id 14 for calling the TestInterp obj's underlying member method code with example usage: obj.test_quadratic_deriv_left(xp, scp) and returns: b,  b