code: def test_missing_data():
      data = np.random.rand(100, 10)
      data[0][0] = np.nan
      geo = plot(data, show=False)
      assert isinstance(format_data(geo), list)
      assert isinstance(format_data(geo)[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 7 for calling a global function with example usage: test_missing_data() without return types