code: def testEmpty(self):
      filt = self.loadSimpleFilter()
      self.assertEqualVector(filt([]), [])
  
file_path: essentia/test/src/unittests/filters/test_iir.py
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestIIR obj's underlying member method code with example usage: obj.testEmpty() without return types