code: def test_unwrap2pi_takes_array_of_float(self):
      a = arange(-10.0, 10.0).astype("float")
      b = unwrap2pi(a)
      # print zip(a, b)
      assert (b > -pi).all()
      assert (b <= pi).all()
  
file_path: aubio/python/tests/test_mathutils.py
imports: from numpy.testing import TestCase, assert_equal
  from numpy import array, arange, isnan, isinf
  from aubio import bintomidi, miditobin, freqtobin, bintofreq, freqtomidi, miditofreq
  from aubio import unwrap2pi
  from aubio import fvec
  from math import pi
label_desc: Use image node_id 4 for calling the aubio_mathutils obj's underlying member method code with example usage: obj.test_unwrap2pi_takes_array_of_float() without return types