code: def test_raw_data():
      x = np.arange(0, 100, 0.1)
      y = [n * x for n in range(1, 4)]
      fig, ax = joypy.joyplot(y, labels=["a", "b", "c"])
  
file_path: joypy/tests/test_joyplot.py
imports: from __future__ import unicode_literals
  import joypy
  import pandas
  import numpy
  from matplotlib import cm
  import pytest
label_desc: Use image node_id 9 for calling a global function with example usage: test_raw_data() without return types