code: def get_xy(self, xp):
      xx = xp.linspace(0.0, 2.0 * cupy.pi, 11)
      yy = xp.sin(xx)
      return xx, yy
  
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 1 for calling the TestInterpPeriodic obj's underlying member method code with example usage: obj.get_xy(xp) and returns: xx,  yy