How to use the oauthlib.oauth2.rfc6749.tokens.BearerToken function in oauthlib

def test_optional_nonce(self, generate_token):
        generate_token.return_value = 'abc'
        self.request.nonce = 'xyz'
        scope, info = self.auth.validate_authorization_request(self.request)

        bearer = BearerToken(self.mock_validator)
        h, b, s = self.auth.create_authorization_response(self.request, bearer)
        self.assertURLEqual(h['Location'], self.url_fragment, parse_fragment=True)
        self.assertEqual(b, None)
        self.assertEqual(s, 302)

def test_create_authorization_grant(self):
        bearer = BearerToken(self.mock_validator)
        self.request.response_mode = 'query'
        h, b, s = self.auth.create_authorization_response(self.request, bearer)
        grant = dict(Request(h['Location']).uri_query_params)
        self.assertIn('code', grant)
        self.assertTrue(self.mock_validator.validate_redirect_uri.called)
        self.assertTrue(self.mock_validator.validate_response_type.called)
        self.assertTrue(self.mock_validator.validate_scopes.called)

def test_custom_token_validators(self):
        tknval1, tknval2 = mock.Mock(), mock.Mock()
        self.auth.custom_validators.pre_token.append(tknval1)
        self.auth.custom_validators.post_token.append(tknval2)

        bearer = BearerToken(self.mock_validator)
        self.auth.create_token_response(self.request, bearer)
        self.assertTrue(tknval1.called)
        self.assertTrue(tknval2.called)

def test_invalid_client(self):
        self.mock_validator.authenticate_client.return_value = False
        bearer = BearerToken(self.mock_validator)
        headers, body, status_code = self.auth.create_token_response(
                self.request, bearer)
        token = json.loads(body)
        self.assertEqual(token['error'], 'invalid_client')
        self.assertEqual(status_code, 401)

def test_optional_nonce(self, generate_token):
        generate_token.return_value = 'abc'
        self.request.nonce = 'xyz'
        scope, info = self.auth.validate_authorization_request(self.request)

        bearer = BearerToken(self.mock_validator)
        self.request.response_mode = 'query'
        h, b, s = self.auth.create_authorization_response(self.request, bearer)
        self.assertURLEqual(h['Location'], self.url_query)
        self.assertEqual(b, None)
        self.assertEqual(s, 302)

def test_create_token_response(self):
        self.mock_validator.get_original_scopes.return_value = ['foo', 'bar']
        bearer = BearerToken(self.mock_validator)
        headers, body, status_code = self.auth.create_token_response(
                self.request, bearer)
        token = json.loads(body)
        self.assertEqual(self.mock_validator.save_token.call_count, 1)
        self.assertIn('access_token', token)
        self.assertIn('token_type', token)
        self.assertIn('expires_in', token)
        self.assertEqual(token['scope'], 'foo')

def test_create_token_inherit_scope(self):
        self.request.scope = None
        self.mock_validator.get_original_scopes.return_value = ['foo', 'bar']
        bearer = BearerToken(self.mock_validator)
        headers, body, status_code = self.auth.create_token_response(
                self.request, bearer)
        token = json.loads(body)
        self.assertIn('access_token', token)
        self.assertIn('token_type', token)
        self.assertIn('expires_in', token)
        self.assertEqual(token['scope'], 'foo bar')

def test_required_nonce(self, generate_token):
        generate_token.return_value = 'abc'
        self.request.nonce = None
        self.assertRaises(errors.InvalidRequestError, self.auth.validate_authorization_request, self.request)

        bearer = BearerToken(self.mock_validator)
        h, b, s = self.auth.create_authorization_response(self.request, bearer)
        self.assertIn('error=invalid_request', h['Location'])
        self.assertEqual(b, None)
        self.assertEqual(s, 302)

"""Construct a new web application server.

        :param request_validator: An implementation of
                                  oauthlib.oauth2.RequestValidator.
        :param token_expires_in: An int or a function to generate a token
                                 expiration offset (in seconds) given a
                                 oauthlib.common.Request object.
        :param token_generator: A function to generate a token from a request.
        :param refresh_token_generator: A function to generate a token from a
                                        request for the refresh token.
        :param kwargs: Extra parameters to pass to authorization-,
                       token-, resource-, and revocation-endpoint constructors.
        """
        self.auth_grant = AuthorizationCodeGrant(request_validator)
        self.refresh_grant = RefreshTokenGrant(request_validator)
        self.bearer = BearerToken(request_validator, token_generator,
                             token_expires_in, refresh_token_generator)
        AuthorizationEndpoint.__init__(self, default_response_type='code',
                                       response_types={'code': self.auth_grant},
                                       default_token_type=self.bearer)
        TokenEndpoint.__init__(self, default_grant_type='authorization_code',
                               grant_types={
                                   'authorization_code': self.auth_grant,
                                   'refresh_token': self.refresh_grant,
                               },
                               default_token_type=self.bearer)
        ResourceEndpoint.__init__(self, default_token='Bearer',
                                  token_types={'Bearer': self.bearer})
        RevocationEndpoint.__init__(self, request_validator)
        IntrospectEndpoint.__init__(self, request_validator)

def __init__(self, request_validator):
        self.bearer = BearerToken(request_validator, None, None, None)
        self.request_validator = request_validator
        BaseEndpoint.__init__(self)