code: def test_str():
      res = format_data("here is some test text")
      assert isinstance(res, list)
      assert isinstance(res[0], np.ndarray)
  
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 4 for calling a global function with example usage: test_str() without return types