code: def test_cauchy_ppc():
      """
      Tests PPC value
      """
      model = pf.GASLLT(data=data, family=pf.Cauchy())
      x = model.fit("BBVI", iterations=100)
      p_value = model.ppc()
      assert 0.0 <= p_value <= 1.0
  
imports: import numpy
  import pyflux
label_desc: Use image node_id 21 for calling a global function with example usage: test_cauchy_ppc() without return types