code: def testEmpty(self):
      # Checks whether an empty input vector yields an exception
      self.assertComputeFails(ConstantQ(), [])
  
file_path: essentia/test/src/unittests/standard/test_constantq.py
imports: from essentia_test import *
label_desc: Use image node_id 4 for calling the TestConstantQ obj's underlying member method code with example usage: obj.testEmpty() without return types