code: def testEmpty(self):
      self.assertComputeFails(MetadataReader())
  
file_path: essentia/test/src/unittests/io/test_metadatareader.py
imports: from essentia_test import *
  import os
label_desc: Use image node_id 8 for calling the TestMetadataReader obj's underlying member method code with example usage: obj.testEmpty() without return types