code: def testNegatives(self):
      input = [1, -1, 2, -2, 3, -3]
      output = NoiseAdder(level=-10)(input)
      k = db2lin(-10.0)
      self.assert_(all(abs(output - input) <= k))
  
imports: from essentia_test import *
label_desc: Use image node_id 4 for calling the TestNoiseAdder obj's underlying member method code with example usage: obj.testNegatives() without return types