code: def test_minus_ones_is_zero(self):
      from numpy import ones
  
      assert level_detection(ones(1024, dtype=float_type), -70) == 0
  
imports: import numpy
  from numpy.testing import TestCase
  from numpy.testing import assert_equal, assert_almost_equal
  from aubio import window, level_lin, db_spl, silence_detection, level_detection
  from aubio import fvec, float_type
label_desc: Use image node_id 4 for calling the aubio_level_detection obj's underlying member method code with example usage: obj.test_minus_ones_is_zero() without return types