text: import base64
  from tests import AsyncHTTPTestCase
  
  
  class AuthTests(AsyncHTTPTestCase):
      def test_auth_without_credentials(self):
          ba = self._app.options.basic_auth
          self._app.options.basic_auth = ["hello:world"]
          r = self.get('/')
          self._app.options.basic_auth = ba
          self.assertEqual(401, r.code)
  
      def test_auth_with_bad_credentials(self):
          ba = self._app.options.basic_auth
          self._app.options.basic_auth = ["hello:world"]
          credentials = base64.b64encode("not:good".encode()).decode()
          r = self.get('/', headers={"Authorization": "Basic " + credentials})
          self._app.options.basic_auth = ba
          self.assertEqual(401, r.code)
  
      def test_auth_with_good_credentials(self):
          ba = self._app.options.basic_auth
          self._app.options.basic_auth = ["hello:world"]
          credentials = base64.b64encode("hello:world".encode()).decode()
          r = self.get('/', headers={"Authorization": "Basic " + credentials})
          self._app.options.basic_auth = ba
          self.assertEqual(200, r.code)
  