code: def test_listify():
      assert listify(None) == []
      assert listify([1, 2, 3]) == [1, 2, 3]
      assert listify("giraffe") == ["giraffe"]
  
file_path: bambi/tests/test_utils.py
imports: import pytest
  import numpy
  import pandas
  import pymc
  from bambi.utils import listify
  from bambi.backend.pymc import probit, cloglog
  from bambi.backend.utils import make_weighted_distribution
  from bambi.transformations import censored, constrained, truncated, weighted
label_desc: Use image node_id 1 for calling a global function with example usage: test_listify() without return types