code: def test_normalize_returns_list():
      assert type(normalize(data)) is list
  
file_path: hypertools/tests/test_normalize.py
imports: import numpy
  from hypertools.tools.normalize import normalize
  from hypertools.plot.plot import plot
label_desc: Use image node_id 1 for calling a global function with example usage: test_normalize_returns_list() without return types