message: Close open files in streaming aead test.
diff: @@ -105,7 +105,7 @@ class StreamingAeadTest(absltest.TestCase):
  filename = os.path.join(tmpdirname, 'file')
  with open(filename, 'wb') as f:
  f.write(b'data')
  - dest = open(filename, 'rb') # dest is not writable
  + with open(filename, 'rb') as dest: # dest is not writable
  with self.assertRaises(ValueError):
  primitive.new_encrypting_stream(dest, b'aad')
  @@ -113,7 +113,7 @@ class StreamingAeadTest(absltest.TestCase):
  primitive = get_primitive()
  with tempfile.TemporaryDirectory() as tmpdirname:
  # src not readable
  - src = open(os.path.join(tmpdirname, 'file2'), 'wb')
  + with open(os.path.join(tmpdirname, 'file2'), 'wb') as src:
  with self.assertRaises(ValueError):
  primitive.new_decrypting_stream(src, b'aad')
  