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"""Tests of credentials."""

import unittest

import grpc


class CredentialsTest(unittest.TestCase):

  def test_call_credentials_composition(self):
    first = grpc.access_token_call_credentials('abc')
    second = grpc.access_token_call_credentials('def')
    third = grpc.access_token_call_credentials('ghi')

    first_and_second = grpc.composite_call_credentials(first, second)
    first_second_and_third = grpc.composite_call_credentials(
        first, second, third)
    
    self.assertIsInstance(first_and_second, grpc.CallCredentials)
    self.assertIsInstance(first_second_and_third, grpc.CallCredentials)

  def test_channel_credentials_composition(self):
    first_call_credentials = grpc.access_token_call_credentials('abc')
    second_call_credentials = grpc.access_token_call_credentials('def')
    third_call_credentials = grpc.access_token_call_credentials('ghi')
    channel_credentials = grpc.ssl_channel_credentials()

    channel_and_first = grpc.composite_channel_credentials(
        channel_credentials, first_call_credentials)
    channel_first_and_second = grpc.composite_channel_credentials(
        channel_credentials, first_call_credentials, second_call_credentials)
    channel_first_second_and_third = grpc.composite_channel_credentials(
        channel_credentials, first_call_credentials, second_call_credentials,
        third_call_credentials)

    self.assertIsInstance(channel_and_first, grpc.ChannelCredentials)
    self.assertIsInstance(channel_first_and_second, grpc.ChannelCredentials)
    self.assertIsInstance(
        channel_first_second_and_third, grpc.ChannelCredentials)


if __name__ == '__main__':
  unittest.main(verbosity=2)