code: def test_complex(self, xp, scp):
      x, y = self.get_xy(xp)
      y = y + 1j * y
  
      # first derivatives at left & right edges:
      der_l, der_r = [(1, 3.0j)], [(1, 4.0 + 2.0j)]
      b = scp.interpolate.make_interp_spline(
          x, y, k=3, bc_type=(der_l, der_r)
      )
      return b(x), b(x[0], 1), b(x[-1], 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 20 for calling the TestInterp obj's underlying member method code with example usage: obj.test_complex(xp, scp) and returns: b,  b,  b