code: def tearDown(self):
      if self.f is not None:
          self.f.close()
      if self.fout is not None:
          self.fout.close()
      unlink(TESTFN)
  
imports: from test.support import findfile
  from test.support.os_helper import TESTFN, unlink
  import array
  import io
  import pickle
label_desc: Use image node_id 2 for calling the AudioTests obj's underlying member method code with example usage: obj.tearDown() without return types