code: def test_order_0(self, xp, scp):
      x, y = self.get_xy(xp)
      return (
          scp.interpolate.make_interp_spline(x, y, k=0)(x),
          scp.interpolate.make_interp_spline(x, y, k=0, axis=-1)(x),
      )
  
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 3 for calling the TestInterp obj's underlying member method code with example usage: obj.test_order_0(xp, scp) and returns: scp,  scp