code: def test_mixed_list():
      mat = np.random.rand(3, 20)
      df = pd.DataFrame(np.random.rand(3, 20))
      text = ["here is some test text", "and a little more", "and more"]
      string = "a string"
      res = format_data([mat, df, text, string])
      assert isinstance(res, list)
      assert all(map(lambda x: isinstance(x, np.ndarray), res))
  
file_path: hypertools/tests/test_format_data.py
imports: import numpy
  import pandas
  from hypertools.tools import format_data
  from hypertools.plot.plot import plot
label_desc: Use image node_id 5 for calling a global function with example usage: test_mixed_list() without return types