code: def test_disp():
      for i in range(100):
          disp = tree.disp(i)
          assert disp > 0
  
file_path: rrcf/test/test_rrcf.py
imports: import json
  import numpy
  import rrcf
label_desc: Use image node_id 4 for calling a global function with example usage: test_disp() without return types