code: def testSilence(self):
      self.assertRaises(RuntimeError, lambda: Key()(zeros(4096)))
  
file_path: essentia/test/src/unittests/tonal/test_key.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestKey obj's underlying member method code with example usage: obj.testSilence() without return types