class_docstr: Test class for the DuoApp
docstr: DuoApp - Generate Auth
docstr_tok: ["DuoApp","-","Generate","Auth"]
code: def test_generate_auth(self):
      """DuoApp - Generate Auth"""
      auth = self._app._generate_auth("hostname", {})
      assert_count_equal(
          list(auth.keys()), {"Date", "Authorization", "Host"}
      )
  
imports: import os
  from mock import Mock, patch
  from moto import mock_ssm
  from nose.tools import assert_equal, assert_false, assert_count_equal, raises
  import requests
  from streamalert.apps._apps.duo import DuoAdminApp, DuoApp, DuoAuthApp
  from tests.unit.streamalert.apps.test_helpers import get_event, put_mock_params
  from tests.unit.streamalert.shared.test_config import get_mock_lambda_context
label_desc: Use image node_id 3 for calling the TestDuoApp obj's underlying member method code with example usage: obj.test_generate_auth() without return types