docstr: Test returned properties.
docstr_tok: ["Test","returned","properties","."]
code: def test_properties(self, xp, scp):
      """
      Test returned properties.
      """
      open_interval = (None, None)
      x = xp.asarray([0, 1, 0, 2, 1.5, 0, 3, 0, 5, 9])
      peaks, props = scp.signal.find_peaks(
          x,
          height=open_interval,
          threshold=open_interval,
          prominence=open_interval,
          width=open_interval,
      )
      return (peaks,) + tuple(
          [props[k] for k in self.property_keys if k in props]
      )
  
imports: import pytest
  import cupy
  from cupy.cuda import driver
  from cupy.cuda import runtime
  from cupy import testing
  import cupyx.scipy.signal
  import numpy
label_desc: Use image node_id 9 for calling the TestFindPeaks obj's underlying member method code with example usage: obj.test_properties(xp, scp) and returns: unknown