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"""Tests of standard AuthMetadataPlugins."""

import collections
import threading
import unittest

from grpc import _auth


class MockGoogleCreds(object):

  def get_access_token(self):
    token = collections.namedtuple('MockAccessTokenInfo',
                                   ('access_token', 'expires_in'))
    token.access_token = 'token'
    return token


class MockExceptionGoogleCreds(object):

  def get_access_token(self):
    raise Exception()


class GoogleCallCredentialsTest(unittest.TestCase):

  def test_google_call_credentials_success(self):
    callback_event = threading.Event()

    def mock_callback(metadata, error):
      self.assertEqual(metadata, (('authorization', 'Bearer token'),))
      self.assertIsNone(error)
      callback_event.set()

    call_creds = _auth.GoogleCallCredentials(MockGoogleCreds())
    call_creds(None, mock_callback)
    self.assertTrue(callback_event.wait(1.0))

  def test_google_call_credentials_error(self):
    callback_event = threading.Event()

    def mock_callback(metadata, error):
      self.assertIsNotNone(error)
      callback_event.set()

    call_creds = _auth.GoogleCallCredentials(MockExceptionGoogleCreds())
    call_creds(None, mock_callback)
    self.assertTrue(callback_event.wait(1.0))


class AccessTokenCallCredentialsTest(unittest.TestCase):

  def test_google_call_credentials_success(self):
    callback_event = threading.Event()

    def mock_callback(metadata, error):
      self.assertEqual(metadata, (('authorization', 'Bearer token'),))
      self.assertIsNone(error)
      callback_event.set()

    call_creds = _auth.AccessTokenCallCredentials('token')
    call_creds(None, mock_callback)
    self.assertTrue(callback_event.wait(1.0))


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