text: # Copyright 2019 Google LLC.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Tests for tink.python.tink.cleartext_keyset_handle."""
  
  import io
  
  from absl.testing import absltest
  
  import tink
  from tink import cleartext_keyset_handle
  from tink import core
  from tink import mac
  from tink import tink_config
  
  
  def setUpModule():
    tink_config.register()
  
  
  class CleartextKeysetHandleTest(absltest.TestCase):
  
    def test_write_read(self):
      handle = tink.new_keyset_handle(
          mac.mac_key_templates.HMAC_SHA256_128BITTAG)
      output_stream = io.BytesIO()
      writer = tink.BinaryKeysetWriter(output_stream)
      cleartext_keyset_handle.write(writer, handle)
      reader = tink.BinaryKeysetReader(output_stream.getvalue())
      handle2 = cleartext_keyset_handle.read(reader)
      # Check that handle2 has the same primitive as handle.
      handle2.primitive(mac.Mac).verify_mac(
          handle.primitive(mac.Mac).compute_mac(b'data'), b'data')
  
    def test_from_keyset(self):
      handle = tink.new_keyset_handle(
          mac.mac_key_templates.HMAC_SHA256_128BITTAG)
      keyset = handle._keyset
      handle2 = cleartext_keyset_handle.from_keyset(keyset)
      # Check that handle2 has the same primitive as handle.
      handle2.primitive(mac.Mac).verify_mac(
          handle.primitive(mac.Mac).compute_mac(b'data'), b'data')
  
    def test_read_empty_keyset_fails(self):
      with self.assertRaises(core.TinkError):
        cleartext_keyset_handle.read(tink.BinaryKeysetReader(b''))
  
  if __name__ == '__main__':
    absltest.main()
  